Chapter 173: When an Avalanche Occurs, No Snowflake Is Innocent

Wang Xiurui found a total of six surveillance videos.

The first surveillance video.

"This was found by the surveillance camera at the entrance of the trade plaza near Li Wei's home."

Wang Xiurui began to introduce.

"There is a shoe repair shop at the entrance of this plaza. Through visits, we roughly understand the time when this shoe repairman appeared nearby."

In the video, the shoe repairman was pushing a bicycle.

The bicycle was relatively old, and the back seat should have been modified to a certain extent.

There was a shoe repair box.

However, due to the angle problem, the shoe repairman's face was not captured in the video.

"In the remaining videos, are there any videos that capture the face of this shoe repairman?"

Wang Xiurui shook his head and looked at Chen Yan: "Captain Chen, none of the videos we found captured this person's face."

Kacha.

Screen casting switched.

"Only this video captured the other person's eyes."

Video playback.

The shoe repairman still had his back to the camera.

However, when he stood up to pack his things, the side profile of the shoemaker was captured by the camera...

"Is he wearing a mask?"

Zhang Yaoming looked at the video, which showed only one eye, and was surprised.

"Yes, Captain Zhang." Wang Xiurui nodded.

"During our visit, we found that this shoemaker always wore a mask and a sun hat."

"No one has ever seen this person's appearance."

"Not only that," Chen Yan walked to the screen: "This person is very cautious."

"You can see that the place he chooses to repair shoes every time is in this kind of corner."

"There are very few surveillance devices around, and even if there are, they can only capture his back."

"And the shoemaker's hands."

"This person has been wearing gloves and has not exposed any skin."

"Everyone, look here."

Chen Yan pointed to the edge of the shoemaker's sun hat with his right hand: "In the six video surveillances, there is not a single video recording of this person's hair."

"And ears..."

"Even the eyes, there is only one..."

Chen Yan stared at the eye in the video carefully.

Danfeng eyes, very attractive.

But it was this eye that made Chen Yan unable to tell whether this person was a man or a woman.

"Can you... tell whether this person is a man or a woman?"

Everyone frowned.

They couldn't answer Chen Yan's question.

"I asked several people in shoe repair shops, and some of them had contact with this shoe repairman."

Wang Xiurui stepped forward and walked to Chen Yan's side, his expression solemn: "These shoe repair shops actually have a certain pattern in their locations."

"Two shops cannot be opened on adjacent streets."

Chen Yan nodded.

Now, shoe repair work is no longer the same as before.

Shoes may be thrown away if they are worn out, not to mention worn out.

So, if a shoe repair shop wants to have business, it must cover a wide range.

If there are two or three shoe repair shops on one or two streets, how can everyone make money?

The same is true for this mobile shoe repairman.

If you enter someone else's territory, they will definitely ask.

"But this shoemaker didn't communicate with them at all."

"He just packed up his stall and left."

"So, we couldn't determine whether this person was a man or a woman during the investigation."

Wang Xiurui paused, then continued: "But judging from the figure of this person in the video, he is about 1.7 meters tall."

"It is more likely that he is a man who can handle so many shoe repair tools."

"But I see that this shoe repair equipment is not light... If it is a woman, it is less likely."

Chen Yan is also more inclined to this judgment.

It's just that this person's eyes...

make Chen Yan a little uncertain.

But in any case, this is an important clue.

At the scene where Song Pengcheng spontaneously combusted, Chen Yan carefully examined the half body.

First of all, it can be determined that the burning of the body is from the outside to the inside.

In addition, Song Pengcheng's body was charred in the upper body, and the calves and soles of the feet were carbonized.

From this point of view, the fire should be burning from the upper and lower directions to the middle.

This is quite strange.

From the burn marks on Song Pengcheng's body, the fire points should be scattered.

But how did the burning of the soles of the feet start?

Moreover, from the remaining flesh and blood tissue of the charred calves, Chen Yan found a long web-like scorch mark.

It was similar to the radioactive web-like marks produced after being electrocuted.

At that time, the autumn rain in Fengxian was drizzling, and there was no thunder at that time.

No lightning was seen falling.

So, where did this suspected electric shock mark come from?

"Now, has this shoe repairman appeared again?"

Wang Xiurui shook his head: "The people who visited the shoe repair shops near Li Wei, Chen Pingping and Wu Jianguo said that they had not seen this shoe repairman in the past half month."

"The time he appeared was probably concentrated between September 1st and 15th."

September 1st to 15th...

In this time period...

Among the spontaneous combustion incidents, the earliest time was September 19th.

In other words, if the other party was deliberately planning, the preliminary preparations should have been completed on the 15th.

"Captain Wang, next, you have to continue to track down this shoe repairman."

Chen Yan began to make work arrangements: "If the other party really has a problem, then they may have completed the plan before September 15th."

"In the later period, it is very likely that it will not appear again, but..."

"The mobile shoe repair vehicle used by the other party is not newly assembled. Someone must have used it for a long time. Find this mobile shoe repair vehicle!"

Chen Yan turned around and looked at Lin Hao: "Captain Lin, how is the autopsy of Song Pengcheng?"

Lin Hao shook his head: "I just asked, it will take some time."

Chen Yan nodded: "Song Pengcheng's autopsy results are very important. Let them speed up the progress as much as possible."

Lin Hao nodded.

He understood what Chen Yan meant.

Song Pengcheng was the only person who left body residues in the spontaneous combustion.

His autopsy report may reveal the secret of spontaneous combustion.

Today is the 27th.

Three days have passed since the 24th.

……

The special case team has entered the busiest stage.

The work arranged by Chen Yan is very detailed.

Each group is doing their best to complete their tasks.

The first person to feedback information is Qin Yun.

The person in charge sent by Zhang Yaoming to verify the case of Yun Guifang and Chen Pingping.

"Captain Chen, my investigation is basically over."

On the projection, there is the personal information of Yun Guifang's family: "The hatred between Yun Guifang and Chen Pingping has a long history."

"The specific things started when the two of them fell in love with a doctor..."

The information Qin Yun brought back was basically the same as what Liang Huifang told Chen Yan.

"Yun Guifang's son is called Wang Qiao."

"A few years ago, he went to Shen City after failing to apply for a position at Dan City First Hospital."

"He is currently working at Shen City Second Hospital and is already the attending physician of the department."

"In the past three months, he has not returned to Dan City. His mother Yun Guifang has been taking care of Wang Qiao's children in Shen City and has not lived in Dan City recently."

Zhang Yaoming frowned: "In other words, although Yun Guifang and Chen Pingping have grievances, the two have not met in recent times?"

Qin Yun nodded: "Moreover, we also investigated Yun Guifang to see if she knew Li Wei and Wu Jianguo."

"However, from the current investigation results, no one in Yun Guifang's family has had contact with Li Wei or Wu Jianguo."

"So, I personally think that Yun Guifang's family...is not very related to the case."

Chen Yan nodded.

He agreed with Qin Yun's opinion.

The deaths of Li Wei, Wu Jianguo and Chen Pingping must have been linked behind the scenes.

However, since Yun Guifang's family had no such contact, they could temporarily consider lowering their suspicion.

After Qin Yun finished his report.

The next person to bring back the news was Wang Jian.

Wang Jian was the detective sent by Zhang Yaoming to search the houses of Li Wei, Chen Pingping and Wu Jianguo.

"Captain Chen, Captain Zhang, we have a major discovery!"

Wang Jian, who rushed back, was very excited.

"What did you find?"

Zhang Yaoming stood up to greet Wang Jian and asked anxiously.

"It's like this, Captain Zhang, our group was divided into several groups according to the arrangement of Captain Chen, and we checked the three families..."

"First, we checked the houses where the three deceased lived."

"But there was nothing found."

"The spouses of the deceased were quite cooperative."

"Next, we also searched the houses where the children of the deceased lived."

"Li Wei's son is studying in Beijing and has no house in this city."

"We didn't find anything unusual in the home of Cheng Pingping's son, Song Pengcheng."

"Wu Jianguo's youngest son teaches at the No. 1 Middle School in the city and lives in a dormitory. We didn't find anything unusual..."

"But we found this at the home of Wu Jianguo's eldest son..."

Several members of Wang Jian's team lifted a box onto the conference table.

"Captain Chen, Captain Zhang, please look!"

Wang Jian carefully opened the box and revealed the contents.

"Shoes...umbrella?"

Zhang Yaoming looked at the two items in the box with some confusion.

"Captain Zhang, this pair of shoes belongs to Wu Jianxiong, the eldest son of Wu Jianguo. Look, the heel has just been repaired."

"And this, the umbrella, is a brand new umbrella."

"According to Wu Jianxiong's confession, the umbrella was uniformly distributed at their construction site half a month ago and has not been used yet."

"As for the shoes, he had them repaired by a mobile shoe repairman at his doorstep..."

Chen Yan picked up the shoes and umbrella and looked at them carefully.

At first glance, there was nothing wrong with them.

Two brand new spikes were nailed on the left and right feet of the shoes.

The quality of the umbrella is very good and it feels heavy in the hand.

"Send it to the laboratory for inspection immediately."

Chen Yan put the things back into the box: "Tell the laboratory that there may be chemicals in the main umbrella, and be careful to prevent fire."

"And this shoe, be careful when handling it, especially the heel, there may be an electric shock device."

Chemicals?

Electric shock device?

"Captain Chen, do you suspect...the spontaneous combustion of Li Wei and four others...was caused by this umbrella and shoes?"

Zhang Yaoming is not a fool.

As soon as I heard Chen Yan's hint, I understood what Chen Yan meant.

As expected.

Chen Yan nodded: "It's just a guess at the moment... But the specific situation still needs to wait for the autopsy results to come out."

Four people died of spontaneous combustion.

Each of them was holding an umbrella on a rainy day and wearing repaired shoes.

These are the only three common points that Chen Yan found in the four videos.

So, the question is here.

Why?

Why must it be rainy?

All four spontaneous combustion cases happened on rainy days.

Wouldn't it be OK on a sunny day?

Could it be that the rain caused the four people to spontaneously combust?

Don't be funny.

It is common sense that rain can put out fires.

Of course, when the temperature reaches a certain level, there are also some specific conditions, such as electrical fires.

After rainwater decomposes into hydrogen and oxygen, it is actually an excellent combustion aid.

But does the human body naturally have such a high temperature?

So why on rainy days?

There is only one reason.

That is the umbrella.

Only on rainy days do people use umbrellas.

The other is shoes.

Why were the shoes of the four people repaired?

The possibility of this coincidence is too low.

So, what is the role of shoes?

In other words, what is the role of repaired shoes?

Chen Yan made a bold guess based on the investigation of Song Pengcheng's remains.

"I guess rainy days, umbrellas, and shoes are necessary conditions for the victim to spontaneously combust on rainy days."

"But how are they related?"

Kacha.

The projection switches to a screenshot of the video before the four people spontaneously combusted.

"Because the video camera is installed at a high altitude, all the videos are taken from a bird's-eye view."

"We can't see the specific situation under the umbrella."

"When Li Wei died of spontaneous combustion, there were no witnesses around. When Chen Pingping and Wu Jianguo died, there were witnesses, but when they found out, they were already on fire."

"So, we never knew what happened to these three people at the first moment of their death."

"For example, did the burning start from the inside out, or from the outside in?"

"Did it start from the top, or from the bottom, or from the middle?"

"It wasn't until Song Pengcheng died that we figured this out."

"When Song Pengcheng spontaneously combusted, Fengxian Hospital security guard Wang Jie had been watching Song Pengcheng walk out of the gate and go to the parking lot."

"So, he witnessed the fire under the umbrella that the surveillance did not capture."

"According to Wang Jie's description, he saw a ball of fire that seemed to be pouring down from Song Pengcheng's head."

"And what was on Song Pengcheng's head?"

"Umbrella!

Chen Yan pointed to the video screenshot: "Yes, it's the umbrella!"

"Moreover, according to the burn marks on the remains of Song Pengcheng's body, there are several burn points of different sizes."

"These burn points are consistent with Wang Jie's description of the fire falling from Song Pengcheng's head."

Chen Yan switched the photo again, it was the remains of Song Pengcheng's body: "Moreover, these burn points have burned holes."

"If Wang Jie and others did not put out the fire with three fire extinguishers in the first time, the body would soon turn into ashes."

"So, I suspect that the starting point of the spontaneous combustion of several people was the brand new umbrellas they held in their hands."

Kacha.

The picture switched.

It was the shoes of the four people in the video.

"Next, let's talk about shoes."

"Let me tell you a hypothesis. If, if there is a fire falling on our heads, what is your first reaction?"

Chen Yan looked at Lan Feng.

"Run!"

"My first reaction is definitely to run away from danger."

Chen Yanyou looked at Wang Jian: "What about you?"

"If I also have an umbrella in my hand, I will definitely throw it away and run, or roll on the ground..."

Yes!

"You are all right!"

But!

"Li Wei, Chen Pingping, Wu Jianguo and Song Pengcheng...why didn't they run?"

Zhang Yaoming, Lan Feng, Wang Jian all reacted.

Yes, why didn't these four people run?

No matter what the situation is, whether it is internal combustion or external causes.

Why didn't the four people run?

"Could it be because the fire was so fierce that they were burned to death in an instant?"

Chen Yan shook his head and looked at Wang Jian who was speaking: "Even if the fire was very big and fierce at the time."

"But the four people should not have no reaction time at all."

"Besides, not only did they not run, they didn't even cry for help."

"Or, they didn't even have the instinct to roll on the ground and try to put out the fire."

"This is unscientific!"

"Is there...a way to make them unable to make a sound or try to put out the fire when the fire is burning?"

Lan Feng knew what Chen Yan meant.

When the four people died, the fact was that they didn't cry for help, nor did they take the initiative to put out the fire.

So, why?

Chen Yan looked at Lan Feng and nodded: "Yes!"

"How did the murderer do it?"

"Before Song Pengcheng died, I was puzzled."

Kacha, the photo switched.

"Everyone, look here."

"This is the lower limbs of Song Pengcheng's body. There are radioactive burn marks on his legs."

"This kind of situation usually only occurs after a high-voltage electric shock, when the current is too large and the protein is charred."

"So, I suspect that the deceased was already pierced by the high-voltage electricity before his body caught fire."

"There was severe damage to the body and brain."

"So, the four people were unable to respond immediately to call for help or put out the fire."

"Because, before they caught fire, they were already in a state of catalepsy."

Card rub.

Video playback.

"This is why, as we saw in the video, the four people were slightly stiff and then immediately set on fire and burned to death."

Turn off projection.

Chen Yan sat back and said, "Of course, all this is just speculation."

"What exactly caused the explosion in the umbrella? Is there really an electric shock device in the shoe..."

"We have to wait for the autopsy report to prove it."

"Also, as long as the inspection results come out for the shoes and umbrellas Wang Jian found at Wu Jianxiong's house, they will prove whether my guess is correct."

…

However, Chen Yan understands.

Even if they figure out what caused the four people to spontaneously combust, they've only solved half of the puzzle.

The key is who the other party is.

Why do this.

Since the murderer planned so carefully and went through so much trouble, he definitely didn't kill for no reason.

There must be a reason behind it.

It is important to understand the method of murder. Chen Yan can arrange for people to look for the murderer from the aspects of explosive materials and high-voltage electrical devices.

However, the motive for the murder is more important.

There is no difference between spontaneous combustion and stabbing to death with a knife.

It's all murder.

It's just that the method is secretive and weird.

The key is to smooth out the entire eucalyptus hair veins.

And why kill people is the first step.

It is also the most important step!

While everyone was waiting for the autopsy results, as well as the test results for Wu Jianxiong’s shoes and umbrellas.

Other news came one after another.

The first is the clue of the new umbrella and shoes used by Song Pengcheng.

A group of people arranged by Lan Feng are specifically responsible for relevant clues and interviews.

"The umbrella used by Song Pengcheng came and was checked. It was given by buying cooking oil."

"Cooking oil?"

Chen Yan was slightly startled: "Basan brand cooking oil?"

The detective who made the report looked surprised: "Uh... I'm telling Team Chen that it is indeed the Basan brand cooking oil."

really.

"Go on."

"According to Song Pengcheng's wife's dictation, Song Pengcheng bought cooking oil in front of his house about half a month ago when he was off work."

"The oil seller gave me an umbrella."

"That's the umbrella Song Pengcheng used when he spontaneously combusted."

"Where are the shoes?"

"This has come to fruition..."

The detective in charge pulled up a surveillance video.

At the door of Song Pengcheng's house.

Moreover, it happened to be a video of Song Pengcheng repairing his shoes.

"This is a video from 11 days ago."

"A mobile shoe repairman nailed Song Pengcheng's shoes."

Shoe repairman!

A familiar figure appeared in front of everyone.

However, the shoe repairman in the video still has his back to the camera.

He wears a sunhat on his head and has gloves on his working hands.

"It's still him!"

Zhang Yaoming looked at the familiar figure in the video with a solemn expression.

"Captain Chen, this person... now seems to be highly suspected of committing murder."

"Even if he is not the direct perpetrator, he must be a person related to the incident."

Chen Yan nodded.

If there are too many coincidences, they must not be coincidences.

This shoe repairman is currently the only person discovered by the special team who has been in contact with several deceased people.

Although, Chen Yan and the others did not have video evidence that Li Wei, Cheng Pingping, and Wu Jianguo had direct contact with this person.

However, based on the inferences from the shoe repair shops around the three people's homes, the logic of the contact can be confirmed.

After all, all three of them repaired shoes, but none of them were in a shoe repair shop, and there just happened to be such a shoe repairman nearby.

Using the elimination method, you will know that the shoes must have been repaired by this person.

"Is there anything else?"

The detective shook his head: "Song Pengcheng has not found anything yet."

"We visited Song Pengcheng's neighbors, colleagues, and some relatives."

"Everyone thinks that Song Pengcheng is humble and courteous. He is very popular in the unit and is highly appreciated by the leaders. This time he is sent to Feng County to increase his resume and prepare to be promoted to deputy chief physician in the department."

"The neighbors in the high-rise residence where he lives are relatively strangers. However, according to the neighbors' reactions, Song Pengcheng always nodded and said hello every time we met. I have never heard of any conflicts with anyone."

"There is currently only so much information about Song Pengcheng."

The shoe repairman once again came into the sight of the special team.

However, at this point, Wang Xiurui was already trying his best to track down the shoe repairman.

There is no result feedback yet.

"Captain Lan, how is the tracing of cooking oil going?"

Cooking oil has appeared twice in Chen Yan's sight.

The first time was when Li Wei was at the funeral home and got cooking oil and an umbrella from the courier guy.

But this time, Song Pengcheng's contact with umbrellas was related to cooking oil.

In fact, this should be a psychological strategy of the murderer.

His fundamental purpose was to get the victim to get the umbrella.

However, if you give an umbrella directly, it will easily cause unnecessary suspicion.

Buying cooking oil and giving an umbrella is different.

After spending money and taking advantage of it, most people will choose it.

But if you give an umbrella directly, people will still suspect that it is fake.

Is there some kind of trick?

Giving an umbrella directly can easily arouse a sense of caution.

"Captain Chen, there's news about cooking oil!"

Kacha.

Lan Feng turned on the screen projection.

"We have tracked down the guy who delivered the takeaway to Li Wei at that time."

"According to his description, he actually got the cooking oil at a grain and oil store at No. 36 Binjiang Road."

"There was also an umbrella, but the person who placed the order did not contact him through the software, but directly asked him to go over to take the order by phone."

"The reward is also in cash, 100 yuan."

"We have surveyed the vicinity of the grain and oil store and found no surveillance."

"The phone number used by the other party is a one-time use and was only used that time."

"We even tracked down the 100 yuan banknote collected by the takeaway boy at that time, and found no abnormal fingerprints on it."

"The other party is very meticulous, and all the fingerprints on the banknotes were erased, leaving only the fingerprints of the takeaway boy."

Chen Yan was not surprised by this.

The murderer behind the scenes planned for a long time.

In fact, it should not be satisfied in one or two years.

First is the shoemaker.

This person is very familiar with the vicinity of Li Wei, Chen Pingping, Wu Jianguo and even Wu Jianxiong's residence.

Especially the arrangement of surveillance, he can find the blind spot of surveillance every time.

You know, the arrangement of surveillance is not static.

However, the other party was able to avoid all surveillance, which shows how familiar he is.

It shows the time he planned.

Therefore, it was within Chen Yan's expectation that no clues were found in the edible oil aspect.

At present, among all the clues that have been advanced, there are still two that have not been responded.

One is to report Li Wei's mass refining of living people, and Lan Feng's team has not yet released information.

The other is that the person in Wu Jianguo's office who may have access to his umbrella has not been found.

Of these two points, Chen Yan attaches the most importance to the second one.

Wu Jianguo's umbrella is the only one among all four people's umbrellas that he did not get in person.

Instead, it was distributed by the nursing home.

In this way, the murderer could not have tampered with the umbrella before the nursing home distributed it.

Unless he can accurately distribute the problematic umbrella to Wu Jianguo.

Of course, this possibility exists.

For example, if Wu Jianguo's office director is the murderer, then this is entirely possible.

The remaining possibility is that someone switched the umbrellas.

The umbrellas in Wu Jianguo's office that were not problematic were switched with problematic umbrellas.

If this person can be found...

Perhaps, by that time, all the mysteries will be revealed.

Now, it depends on how long the clues left by the other party can last!

Three hours later.

There was exciting news.

Meeting room.

Another case analysis meeting was held.

Song Pengcheng's autopsy report finally came out.

Everyone in the special case team held a copy of the report in their hands.

The first line of words.

Cause of death.

After electric shock paralysis, death by burning!

Was it really electric shock?

Everyone in the special case team had incredible expressions on their faces!

Li Wei, Chen Pingping, Wu Jianguo, and Song Pengcheng, all four of them died in the self-immolation fire on a rainy day, without any struggle.

"Captain Chen... this, this, this..."

When Zhang Yaoming received the incident report, he felt it was incredible.

Just three hours ago, although they had heard a series of speculations from Chen Yan, they were just speculations.

And now, the living evidence was placed in front of the special case team.

The internal detective in charge of the autopsy was Qin Yijun, a middle-aged woman.

"Captain Zhang, Captain Chen," Qin Yijun personally explained the autopsy report to everyone: "After the deceased participated in the autopsy, there were obvious traces of electric shock inside."

Kacha.

The projection screen switched.

"This picture is a cross-section of the remains of Song Pengcheng's body. Everyone look here..."

In the cross-section picture, there is a radioactive web-like scorch mark.

"This mark extends from the two thighs of the deceased and goes up, causing great damage to the body of the deceased."

"The organs in the abdomen have been pierced, and there are traces of carbonization."

"Although the upper body of the corpse has been charred and disappeared, it can be inferred from the electric shock scars of this degree..."

"The deceased was paralyzed by the electric shock and could not make any movements in the moment before the spontaneous combustion."

"In other words, the deceased could only watch himself burn, and could not call for help or put out the fire"

Qin Yijun's explanation made everyone fall into deep thought.

Spontaneous combustion, now it seems, should be a cover-up, or a ritual.

"Captain Chen...you are really awesome!"

Lan Feng, who was standing aside, stood up at this moment and looked at Chen Yan with a shocked face.

Lan Feng rarely admires people.

His temper is well-known in the entire Dan City Detective Team.

He recognizes people with strong case-solving ability.

In itself, Lan Feng is the most powerful case-solving ability in the Dan City Detective Team.

Over the years, he has also solved many cases.

However, because of his bad temper and his inability to get along with his superiors, he was always the leader of the case handling team of an ordinary detective team.

It was not until Zhang Yaoming came to the Dan City Detective Team.

Lan Feng became the leader of the detective team.

However, even Zhang Yaoming was ignored by Lan Feng.

He simply thought that Zhang Yaoming's case handling ability was not as good as his.

However, Lan Feng was really impressed by Chen Yan.

He had only been in Dan City for a few days.

Just two days and one night.

The speed at which the case progressed surprised everyone.

Moreover, the work was arranged in an orderly manner, and the analysis of clues and details was very accurate.

On my side, I just have to carry out the orders.

This makes Lan Feng very comfortable to work.

However, the cases are complicated and confusing. It can be said that Lan Feng cannot see any correlation among these cases.

But, what now?

Umbrellas, shoes, shoe repairman...

Three important clues have been connected.

Chen Yan has even simulated the murderer's method.

Now, Song Pengcheng's autopsy report has also verified Chen Yan's guess.

No wonder the superiors sent someone here.

This is ability.

Except for Lan Feng, everyone else looked at Chen Yan with surprise and admiration.

"Team Chen, what should we do next?"

At this moment, everyone saw the dawn of the broken eucalyptus.

Chen Yan shook his head: "The determination of the cause of death can be said to have solved part of the mystery."

"Since Song Pengcheng was paralyzed by electric shock, then the death process of Li Wei, Chen Pingping, and Wu Jianguo is likely to be the same."

"This explains why the four people did not yell loudly or fall to the ground to put out the fire when they spontaneously combusted."

"Because these four people were already paralyzed by electric shock when they spontaneously combusted."

Chen Yan did not arrange work, but looked at Qin Yijun: "What is the metal powder in the report?"

"This has been tested and is aluminum powder and iron powder..."

Aluminum powder and iron powder?

Some metal debris was also found at the scene where Li Wei and others died.

Everyone originally thought these things were leftover after the umbrella ribs were burned.

But why are they aluminum powder and iron powder?

When metal melts when exposed to high temperatures and condenses when exposed to cold, what should be formed should be chips or beads...

It should not be powdery.

While everyone was wondering, good news came from the laboratory.

"Team Chen, Team Zhang, the decomposition of shoes and umbrellas has been completed, and major discoveries have been made!"

The detective in charge of this aspect looked excited.

"We found out why the deceased was able to spontaneously combust!"

On the conference table are dismantled umbrellas and shoes.

"Captain Chen, there is indeed something wrong with these shoes."

It turned out that a special device was implanted in the heel of this shoe.

It is a homemade discharge device. "

Although the power generated by this thing is relatively small, the instantaneous voltage of this device can be as high as 10,000 volts!

Once the voltage of 10,000 volts is touched by the human body, it can cause paralysis and stiffness in an instant.

High-voltage electric shock, above 36 volts, is dangerous voltage.

The household voltage of 220 volts, once you get an electric shock, cannot be disconnected in a short time, it will be life-threatening.

As for the voltage of 10,000 volts, if it lasts for a longer time, people can fly to ashes and die.

"The upper frame of the umbrella is specially made."

"The contents inside are aluminum powder and some catalytic substances."

Catalytic substance?

Chen Yan stepped forward to check and frowned slightly: "Is it... thermite reaction?"

When Chen Yan heard the detective in charge of the test talking about catalytic substances, he immediately remembered what he had learned in high school about the oxidation and reduction of iron.

Although the specific equations and chemical reactions have been forgotten, Chen Yan still has an impression of the term.

No wonder there were iron powder and aluminum powder on Song Pengcheng's body.

So that’s what happened.

"Team Chen, you are right, it is the thermite reaction."

"The murderer is very powerful. He stored thermite in the umbrella frame and also built in electronic devices."

"We have tested that there is an inductive system for this device and for the high-voltage electrical device in the shoe."

"Once rain is detected and the umbrella and shoes are within a certain distance, the thermite explosion will occur!"

"The burning temperature of thermite can reach over 3,000 degrees Celsius. At this temperature, the human body will carbonize in just a few minutes."

"Moreover, this chemical reaction also has a self-extension effect, that is, once it occurs, the reaction can continue until the end of the reaction by relying on the heat released by the chemical reaction itself."

"As for rainwater, it is impossible to terminate this high-heat chemical reaction during this process. It will even be decomposed into hydrogen and oxygen by high temperature, which will ultimately support combustion..."

The detective in charge of the laboratory test gave the special team a chemistry lesson.

Although many people didn't understand it, in the end everyone understood it.

The murderer uses a high-voltage device in the shoe to kill the victim first, making it impossible for him to struggle or call for help.

Afterwards, the thermite in the umbrella detonated simultaneously, erupting into a high temperature of 3,000 degrees Celsius in an instant, burning the body to ashes.

As a result, this effect appears to be spontaneous combustion of the human body.

Sure enough, there is no weirdness in the world, it's just that we don't have enough knowledge and can't think of it.

Although Chen Yan had guessed the other party's method, he still didn't know the specific method.

High voltage electricity is physics, thermite reaction is chemistry...

Chen Yan is not very good at these two points.

"Team Chen, what should we do next?"

Chen Yan looked at Zhang Yaoming who was asking the question: "Wait!"

"All we can do now is wait."

"After the Lanfeng team has finished investigating two things, I need to confirm something..."

…

7 a.m. on the 28th.

The news came.

Last night, after the meeting, Lan Feng went directly to the scene.

Didn't sleep a wink all night.

Outside the interrogation room.

Li Fengtian, the office director of Xiyanghong Nursing Home, is accepting Lan Feng's inquiry.

"If there is anyone in Dean Wu's office, besides him, I am the only one who has it."

"I go to the nursing home early every morning to clean Dean Wu's office."

"You clean it yourself?"

"Yes, I clean them all myself..."

"Oh, by the way, some time ago, in addition to me, there was a young man who was a volunteer at our nursing home. He went to the nursing home relatively early and helped me with the work for a few days."

Volunteer, cleaning the dean's office?

Chen Yan said through the microphone in the monitoring room: "Lan Feng, ask him about this volunteer."

Monitoring room.

"What is this volunteer's name? How old is he? Is he still in your nursing home now?"

Li Fengtian nodded: "This volunteer's name is Dong Lingyun, he is in his 20s..."

"We have always been in the nursing home, but this young man comes three times a week, Monday, Wednesday and Friday. He is not usually here."

Dong Lingyun?

When Lan Feng heard Li Fengtian say this name, his heart suddenly moved.

Instructing his colleagues to continue, Lan Feng left first.

The surveillance room next door.

Lan Feng looked solemn: "Team Chen, we made an unexpected discovery."

…

Projection is on.

"This man, named Dong Dejun, is Li Wei's colleague and also works in the funeral home."

"You asked me to keep track of the matter of reporting Li Weiwei as a living practitioner. Progress has been slow in the past two days."

"Dong Dejun was rather vague about what happened back then, and he never cooperated with our work."

"So, we focused on investigating Dong Dejun's personal information..."

"As a result, although this Dong Dejun is 54 years old, he is not married. Instead, he adopted a child ten years ago."

Adopted a child?

Chen Yan looked at Lan Feng: "This child...is the volunteer Li Fengtian mentioned...Dong Lingyun?"

Lan Feng nodded: "Yes, that child's name is Dong Lingyun, but I'm not sure if it's the Dong Lingyun Li Fengtian mentioned."

If you’re not sure, check it out!

Thorough investigation.

"Summon Dong Dejun and Dong Lingyun immediately."

Chen Yan finally made the decision: "At the same time, find out the details of Dong Dejun's adoption of Dong Lingyun."

"Who is Dong Lingyun's biological father, why he was adopted, where he has been these past years, and what he does for a living. I want all the information about Dong Lingyun."

Lan Feng nodded heavily.

This information is very crucial.

It has been made clear that there is no connection between Li Wei, Cheng Pingping and Wu Jianguo.

However, they all died.

Why did the murderer kill three unrelated people?

And it was carefully planned for so long.

Therefore, there must be a reason behind it that no one knows.

Now, Dong Lingyun is the only person who can possibly connect Wu Jianguo and Li Wei.

If you have a target, you can check these basic information very quickly.

Dong Lingyun, formerly known as Wang Lingyun.

Ten years ago, he was adopted by Dong Dejun.

At that time, Dong Lingyun was 14 years old.

As for Dong Lingyun's parents, they died in a car accident when Dong Lingyun was 7 years old.

Later, Dong Lingyun lived with his grandfather Wang Side.

It's just that the sky is unpredictable, and people have misfortune and good fortune.

When Dong Lingyun was 13 years old, Wang Side suffered from cerebral palsy and could not take care of himself.

And Dong Lingyun couldn't take care of the old man all the time because he had to go to school.

Fortunately, Wang Side had some savings and some compensation from Dong Lingyun's biological parents after their car accident. Dong Lingyun sent the old man to a nursing home.

However, a year later, the old man was admitted to the hospital due to burns and eventually died.

…

trial room.

Chen Yanzai interrogated Dong Dejun personally.

"Dong Dejun, can you tell me why you reported Li Weiwei for refining a living person?"

"What happened back then was a misunderstanding. I had already been punished back then, and those things have long been forgotten..."

forget?

Have you really forgotten that every time you drink, you will scream that you are wronged?

However, now, it is no longer a question of whether Dong Dejun talks or cooperates.

What happened to old man Wang Side back then foreshadowed everything today.

"Dong Dejun, since we called you here, we know what happened back then."

"Ten years ago, you adopted Dong Lingyun."

"As for Dong Lingyun's grandfather, Wang Side, you should know better than anyone else, right?"

At this moment, Dong Dejun suddenly raised his head, his face already ashen.

Chen Yan saw everything and said without pause: "Ten years ago, Wang Side suffered from cerebral palsy and was sent to Sunset Red Nursing Home by 13-year-old Dong Lingyun."

"The director of this nursing home is called Wu Jianguo. Are you familiar with this name?"

"Wang Side was in a nursing home back then. Due to poor care by the nursing staff, the electric blanket on the bed caught fire and caused extensive burns."

"Then, he was sent to the burn department of the First Hospital by the nursing home. He died not long after."

"I checked the records from that year. In the burn department, the nurse responsible for caring for Wang Side was called Chen Pingping..."

"You must be familiar with this name."

"That night, Wang Side's body was sent to the funeral parlor."

"You were on duty with Li Wei that day. According to the procedure, you were responsible for checking Wang Side's death certificate and changing the old man's clothes."

"But Li Wei was drinking and pushed the old man directly into the crematorium..."

"Dong Dejun, are everything I said correct?"

Dong Dejun let out a long breath at this moment.

"What happened back then, I am very sure that Wang Side is really not dead!"

Dong Dejun explained everything.

"Back then, Chen Pingping went home temporarily to take her son to the No. 1 Hospital because her son had a fever."

"But, she forgot to change the oxygen bottle for Wang Side."

"When she came back, Wang Side must have passed out due to lack of oxygen."

"Chen Pingping was afraid of taking responsibility at the time, so she did not check carefully and directly reported Wang Side's death..."

"Then the body was brought to the funeral home."

"However, when I checked, the old man had recovered somewhat and could move his fingers..."

"He is definitely not dead, but Li Wei didn't listen. He drank too much and pushed the person directly into the crematorium..."

…

According to Dong Dejun's account of what happened that year, although he made a report, the person had been cremated and there was no evidence.

Where is the death certificate? How could it be judged that Li Weiwei was a living person just based on Dong Dejun's words?

What's more, it still involves doctors, nurses, and people from the funeral home.

Therefore, this matter was dropped.

However, everyone thought it was impossible, but Dong Lingyun believed what Dong Dejun said.

14-year-old Dong Lingyun is already sensible.

Dong Lingyun, who originally depended on his grandfather and was unwilling to be separated, was obviously more willing to believe Dong Dejun's words.

What's more, Dong Dejun will definitely talk about this matter whenever he gets drunk these years.

It is conceivable that in Dong Lingyun's heart, he must feel that the people at Sunset Red Nursing Home, No. 1 Hospital, and the funeral home killed his grandfather.

Moreover, it is an indisputable fact that Wang Side was burned due to a mistake at Sunset Red Nursing Home.

However, the caregiver at that time died of a heart attack 7 years ago.

Dong Lingyun wanted to take revenge, but it was impossible.

However, Wu Jianguo is still alive.

As the director of Sunset Red Nursing Home, Dong Lingyun naturally set his sights on revenge.

Another interrogation room.

Dong Lingyun was very calm when facing Chen Yan.

"Since you can find me, you should already know what happened back then, right?"

Chen Yan nodded.

Not only that, Lan Feng immediately organized detectives to search the residences of Dong Dejun and Dong Lingyun.

Chen Yan was shocked when he saw what Lan Feng brought back.

ten years!

A whole decade.

Dong Lingyun started planning all this since he was adopted by Dong Dejun.

When he was in school, Dong Lingyun would walk around the gates of Li Wei, Chen Pingping or Wu Jianguo every time after school.

Later, when Dong Lingyun grew up, he began to plan this action.

Bicycles for repairing shoes, materials for making thermite, and high-voltage discharge devices were all found in Dong Lingyun's home.

Chen Yan nodded.

With these, Dong Lingyun was actually able to be convicted.

However, Chen Yan still wanted to see this person.

"does it worth?"

hehe.

Ha ha!

Dong Lingyun laughed: "Do you think it's worth it?"

The expression on his face is like a ghost!

"My grandpa could have been saved!"

"But, he was burned alive!"

"Do you think they should die?"

"So, you want to end their lives by spontaneous combustion?"

"Yes, if it weren't for the purpose of testing this method of death, I would have killed them long ago..."

"I want them to have a taste of what it feels like to be burned to death?"

Chen Yan left.

He did not ask Dong Lingyun what if Dong Dejun was wrong.

What if Wang Side really died back then and everything was a misjudgment by Dong Dejun.

Because there is no need.

It is true that the nursing home managed by Wu Jianguo has problems.

It is also true that Chen Pingping's poor care back then caused the elderly man to suffer from hypoxia.

Li Wei...it's true that he came to work after drinking that day.

Just like back then, everyone thought Wang Side was dead.

However, Dong Dejun didn't believe it.

Dong Lingyun didn't believe it either.

This is enough.

Behind every death of hatred is a tragedy.

When an avalanche occurs, no snowflake is innocent.

…

－－－－－－Digression－－－－－

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