Q City, Airport.

In the lane outside the runway, a convoy had long been parked.

A group of people in black Nakayama uniforms stood outside the vehicle.

Facing the civil aviation airliner slowly descending from the sky, pay attention to the salute.

When Xiao Yu and Wang Dong stepped off the plane and walked to the front of the convoy.

The members of the second group brushed their hands in unison and saluted.

Xiao Yu returned the salute, everyone got on the bus, and the convoy left.

This scene.

It attracted the sideways glances of the disembarking passengers not far away.

Countless people stared at the convoy in disbelief and began to make up all kinds of brains…

The convoy sped all the way to the Q City Bureau.

Provincial capitals will have such special permanent institutions.

It was another flip to greet, but the scene was not big, and the level was very high.

Wang Dong knew the personality of the little brother and did not like these so-called cards.

So I told you not to do the whole moth thing, be careful of your ass.

If Xiao Yu was angry, the big boss would have a headache.

Conference room.

There are no ‘outsiders’.

Only Xiao Yu and the second group of personnel.

His eyes were fixed on the curtain on the wall, staring at the projection light curtain.

Look at the most detailed on-site investigation of this case, and the case file.

“The twelve victims are all smart device enthusiasts, and the scene of the murder is basically a place of residence, with a large number of smart home appliances and equipment.”

“Through on-site investigation, we found that these victims’ homes have intelligent voice master control devices, which can control most of the smart home appliances in the room.” Such as, smart door locks, smart air conditioners, smart water heaters, smart pressure cookers, smart distribution boxes… Wait. ”

“The causes of death of the twelve victims were four deaths from electric shock from water heater leakage, two cases of harmful gas poisoning of air conditioners, two explosions of pressure cookers, two cases of humidifiers, one spontaneous combustion of television sets, and one leakage of electricity from washing machines.”

“The twelve victims, all killed in different cities, so it looks very similar to accidental deaths, but through various indications and on-site investigation by our personnel, it can be confirmed that all of them are man-made.”

“The reason why it is so clear is that the twelve victims are all single, women, and all the air conditioners in the home are turned on, except for one person who caused a fire due to a television set and the body was burned. When the bodies of the other eleven victims were found, they were all in a state of high decay. ”

“It can be said that all twelve victims were killed by the murderer using the malfunction of smart devices.”

“However, through the cooperation of computer and smart equipment technicians dispatched by our side, it was found that the smart devices in the homes of the twelve victims were completely devoid of traces of human intrusion, and all of them were in a ‘normal’ state.”

“So… We can’t find any clues left by the murderer! ”

A member of the second group looked bitter, staring at Xiao Yu, who was sitting in the chair in front of him, squinting at the projection light curtain, “Boss, we have so many things to investigate.” ”

“It’s been hard.”

Xiao Yu smiled, “Just try your best.” ”

The crowd, including Wang Dong, was ashamed.

They will not look for excuses such as ‘time is too short’, ‘case suspense’, ‘cross-provincial and municipal difficult to investigate’.

If you don’t find a trace clue, you just don’t find it.

They are all people, and if they are people, they will have blind spots in knowledge.

Even Xiao Yu had areas he wasn’t good at and didn’t know.

But you can learn, to touch, to understand.

Finally, it becomes its own experience.

Why is the old criminal investigator so good?

Because of the experience!

“Go live.”

Xiao Yu got up and walked outside.

Why is the first stop in Q City?

This is because it is the only victim city that retains surveillance video.

That is, the video that Xiao Yu had seen of the murdered woman being killed.

Xiao Yuxin is not the investigation ability of the second group?

No.

Going to the scene is not necessarily looking for clues, it can also be looking for ‘abnormalities’.

Some cases are flawed, not necessarily on the most conspicuous clues and traces.

It’s some kind of ‘abnormality’.

Abnormal, that is, abnormal, different from usual.

Xiao Yu liked to say the phrase ‘there must be a demon when things go wrong’.

Abnormal, that’s what it means!

……

Walk into a neighborhood and walk into the residential building where the victim is located.

“Song Ni, female, 26 years old, Q city people, single, manager of a private enterprise, monthly salary of 20,000 yuan, self-purchased property, living alone …”

Inside the elevator, Wang Dong had a serious expression, “According to the time deduction, she is the eleventh victim, and the body occurred sixteen days ago.” Her girlfriend called the police because she couldn’t find anyone. ”

“However, at that time, the police had arrived at the scene half a day in advance. The reason is that the body is high and decomposing and emits a foul odor, and the residents of the same building look for the property, and the property confirms that the odor is emitted from the victim Song Ni and calls the police. ”

The elevator door opened, and Xiao Yu did not speak.

As his mind wandered, he remembered the video content he had watched.

I still remember that after the victim Song Ni returned home, she called her girlfriend, went out to eat, and went home drunk.

Later, there was a smart device ‘killing’ accident.

Suspicious?

Why should Xiao Yu suspect this girlfriend?

Occupational disease.

Because the police will habitually list the police as suspects in handling cases.

Why?

Because in this world, there are cases where the police are called to the police.

More than 4% of the police were murderers.

Of the hundreds who called the police, more than four were perpetrators.

Do you still think this probability is low?

So why do people like them call the police?

Cover your ears and steal the bell, self-deception psychology.

First, they want to cover up and confuse the scope of the police’s investigation.

Second, I want to take the opportunity to use the special identity of the discoverer to make up for the important plots in the case in the later stage to delay the detection of the police.

Because he is the policeman, the testimony is more critical and will mostly be accepted by the police.

It is also extremely easy to lead to the correct reverse development of the facts of the case.

The point is that if you know what the police have correct inferences, you can also slip away!

“Have you checked?”

Standing outside the door of an opened door guarded by two team members, Xiao Yu took the disposable shoe cover handed by the team member and put it on the leather shoe.

Wang Dong is also an old criminal investigator.

Xiao Yu didn’t think he would make such a low-level mistake.

“Definitely checked.”

Wang Dong, who was wearing a shoe cover, rolled his eyes and shook his head, “There is no abnormality.” ”

“Hmm.”

Xiao Yu nodded and walked into the scene of the victim’s crime.

The increase in the sense of smell in the nose of the king butterfly also allowed him to smell a corpse odor for the first time.

Xiao Yu did not go to the bathroom where the victim died, but looked at the hall.

Eyes fell on some appliances…

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