Detective: Open your eyes, I am handcuffed in the interrogation room

Conference room.

Chen Yi's words changed the current thinking of the case.

The police checked the surveillance of the repair shop to determine whether Qian Dakang had sufficient alibi. Assuming that Qian Dakang was not the murderer in this case, if the surveillance was intact, he would have been photographed in the repair shop at the time of the crime.

Without the time to commit the crime, there would be no suspicion of committing the crime.

If Qian Dakang wanted to increase his suspicion of committing the crime and disrupt the direction of the police's investigation, he had to prevent the police from seeing the complete surveillance of the repair shop. Deliberate damage was a simple and safe way.

As for why he did this, the answer was obvious.

Chen Yi said: "A case of parents taking the blame for their children happened in Yangcheng a few years ago. The dismemberment case caused a great sensation and social impact. When investigating, I didn't expect the suspect to have so many tricks. This case gives me a feeling that is very similar to that case.

At present, Qian Dakang has not admitted that he killed someone. As long as there is a suspicion, I think... if Qian Yu becomes the key suspect, he should confess immediately."

Lu Zhengkai: "In other words... the murderer is Qian Yu, and he is seeking revenge for himself?"

Chen Yi said: "It may not be revenge for himself. Zhang Menhai and Qian Dakang didn't drink properly during the meal. It was a bit coincidental and deliberate. Zhang Menhai mentioned that Qian Dakang seemed to deliberately force him to drink when they were drinking.

When people are seriously drunk, their memories are fuzzy and their thinking is confused, but they still have an impression of what they heard. , a little reminder will remind him, Qian Dakang's purpose may be this.

Damaging the surveillance camera not only provides the police with time to commit the crime, but also adds a motive for committing the crime just in case.

With both the time and motive for committing the crime, Qian Dakang's suspicion is getting bigger and bigger. In this case, we will shift our attention away from Qian Yu. "

Lu Zhengkai thought: "Take advantage of Zhang Menhai's drunken state to force him to instill memories that do not exist? Is there such an operation?"

Chen Yi: "Direct indoctrination is of course not possible, there are risks, and you have to change the concept and pay attention to the method, such as telling Zhang Menhai that you knew about this matter before, but you just forgot it.

In this way, when facing the police's questioning, Zhang Menhai will only say that he seems to have heard it, but he can't remember when he heard it or who said it. "

Lu Zhengkai pondered and judged the possibility of this speculation.

As Qian Yu's suspicion continued to increase, Qian Dakang's behavior did begin to reveal strangeness. There is a possibility of clearing his son's suspicion, unless the two committed the crime together.

"It would be great if there was a way to exclude Qian Dakang's suspicion of committing the crime." Lu Zhengkai said to himself. As a special consultant of the task force, Chen Yi's opinion should be seriously considered, and the final result still depends on the evidence.

The room was quiet for a while, and Chen Yi said: "Bring Qian Dakang's interrogation video here, let me see it."

A police officer left quickly, and soon brought a laptop computer and placed it on the table in front of Chen Yi, and called up the video file.

Chen Yi watched slowly.

The direction of this case has been determined. Anyway, the problem lies with Qian Dakang and his son. Now is the stage of pursuing details. If something is done, there must be traces. Whether it is Qian Dakang or Qian Yu, it is impossible to handle all the clues cleanly.

Lu Zhengkai stopped talking and repeatedly looked through the investigation report submitted, looking for overlooked points.

Half an hour later, the police officer who was responsible for purchasing the same knives as Qian Dakang's family came back.

This set of knives is not available in physical stores. The task force directly contacted the local e-commerce and took it from the e-commerce warehouse.

After comparison, it is exactly the same, without any difference.

Lu Zhengkai took the photo to confirm again. After it was correct, he asked someone to send the fruit knife to the forensic room.

The feedback came back quickly. Judging from the wound, it was caused by this knife or a knife of the same shape and size. There was no mistake.

But this cannot be used as evidence.

Qian Dakang's home was missing a knife. Qian Dakang could not explain where it went. In addition, the destruction of the surveillance and his attitude towards the interrogation made it certain that he was inseparable from the case.

Either the murderer or an insider.

"Chen..." Lu Zhengkai was about to speak, but seeing that Chen Yi was watching the video seriously, he did not interrupt him and turned around to order, "Go and tell Zhuoyun to bring Qian Yu back to school immediately to cooperate with the investigation. Pay attention to the methods and try not to expose the identity of the police, let alone cause confusion."

The police officer took the order: "Yes!"

In front of the laptop, Chen Yi pressed the back button and began to watch the interrogation process for the third time.

This Qian Dakang is a very cautious person with a stable psychological quality, which should be related to his identity as an intelligence broker in his early years.

It is easy to offend people when you are an intelligence broker. If you sell intelligence at noon, someone might come to your door with a knife in the evening. You can't do it without some ability.

Not only do you need to be capable, but you also need to have a certain prestige so that everyone around you dare not touch you easily.

This is similar to the know-it-all in martial arts novels. If you know so many things about others, you will definitely be targeted. It is more important to save your life than to make money. You have to have a life to spend it.

"Huh?"

At a certain moment, Chen Yi pressed the pause button. At this time, Qian Dakang was sitting on the chair in the interrogation room, with his right fist curled up, but the finger surface was uneven, and the middle finger could be clearly seen to be slightly raised.

After thinking for a while, Chen Yi rewound or fast-forwarded according to his memory, found five times when Qian Dakang clenched his fist, and took screenshots one by one.

Comparing the five screenshots, it was found that Qian Dakang's middle finger was raised when he clenched his fist. This was not a coincidence.

The arc of the raise was very different from that of normal people.

"I'm going out for a while."

After discovering this, Chen Yi thought for a moment, adhering to the concept of not letting go of any possible case handling, got up and left the conference room.

After walking through the corridor, he stood in front of the detention room door. Qian Dakang was sitting there with his head bowed, not knowing what he was thinking.

There were police officers standing guard at the door.

For detained persons, the police need to send people to take turns guarding them 24 hours a day, so that the suspect cannot be left out of sight for even a second to prevent the suspect from making excessive actions.

Of course, the detention room was all filled with anti-collision materials, and there could be no sharp weapons. It was impossible to commit suicide unless you bit your tongue and tried your luck to see if you could die.

There is no scientific basis for committing suicide by biting your tongue. The consequences are at best massive blood loss, blockage, suffocation, and neurogenic shock. As long as you are rescued in time, you will definitely not die.

"Open the door." Chen Yidao.

"Yes!" The police officer stood at attention first, then took out the key and opened the door of the detention room.

Chen Yi walked in.

Hearing the noise, Qian Dakang, who was sitting there, raised his head and spoke first: "Captain Chen."

Chen Yi stood in front of him: "It seems he knows me."

Qian Dakang showed a reluctant smile: "Of course we know him. Who in the whole Yangcheng doesn't know Captain Chen's name? I even talked about you when I met Lao Meng some time ago."

As he spoke, he also stood up out of politeness, leaving half a meter between them.

"Really? Then shake hands." Chen Yi stretched out his right hand.

Qian Dakang was stunned for a moment and didn't know why, but he still reached out and shook hands with Chen Yi.

Chen Yi felt the strength of the opponent's five fingers and said: "Press harder."

Qian Dakang was surprised: "Huh?"

Chen Yi: "Just use your strength, don't hold anything back."

"Okay..." Qian Dakang didn't know what the other party wanted to do, so he increased his strength.

In an instant, the power of an adult man came through Chen Yi's palm and entered his brain, and he had already determined the answer.

After a while, the two let go of their hands.

Chen Yi recalled the photos of the autopsy report. There were pinch marks on the necks of the two children. Although the marks were not particularly obvious, they were enough to determine certain facts.

"Sit down, let's chat." He sat down first.

Qian Dakang was in awe of this rumored figure, mainly because his reputation was so famous that even Meng Yi could go through fire and water for him, and he could not tolerate any slights from him.

When he saw Chen Yi in the interrogation room a few hours ago, he was panicked.

The two parties sat down. Chen Yi stared at Qian Dakang for a while and said, "Does the death of Ji Jingfu's family have anything to do with you?"

Qian Dakang replied subconsciously: "It doesn't matter, it really doesn't matter, I don't know him at all."

Chen Yi nodded: "I believe it."

Those two words made Qian Dakang unstoppable. He was actually... mentally prepared.

If no clues were found, Captain Chen would not have come to see him in person.

"Uh...thank you." After holding it in for a long time, Qian Dakang felt that he should say thank you.

Chen Yi continued: "Since it was not you who did it, based on the clues we have so far, it can only be Qian Yu."

Hearing this, Qian Dakang's expression suddenly changed, and he quickly said: "It has absolutely nothing to do with Qian Yu! He is still a child, how could it be possible..."

"Qian Dakang." Chen Yi interrupted, "He is already a junior in college, and he is 21 years old. Do you think he is a child? I have dealt with murderers younger than him. Crimes are irrespective of age. ”

Qian Dakang didn't know how to argue and panicked: "Captain Chen... no, no, no, it's definitely impossible. Xiaoyu is just a... student, just a student. It's impossible to know that Ji Jingfu, and there's no reason to kill Ji Jingfu. My whole family, you know what’s going on, don’t talk nonsense!”

Chen Yi sighed: "Qian Dakang, you are a smart man. You should know that the police have basically determined that you and your son have a big problem after their investigation. If you want to choose one of the two, who do you think you should choose?"

Qian Dakang opened his mouth and was about to say something. At this moment, Chen Yi's voice sounded again: "Don't say it was you who did it. I know it wasn't you. Even if you admit it, can your confession match the scene? Even if you detailed I asked Qian Yu to confirm, but the muscle weakness in your middle finger is inconsistent with the traces of the corpse. "

After hearing the last sentence, Qian Dakang immediately lowered his head and suddenly understood why Chen Yi wanted to shake hands with him just now.

"Are you injured or sick?" Chen Yi asked.

Qian Dakang: "I..."

Chen Yi waved his hand: "Let's not talk about anything else, just the middle finger of your right hand. We can confirm this with any doctor. There is no need to lie."

Qian Dakang was silent for a while and then said: "With neuropathy, not only is it difficult to exert strength, but it is also difficult to bend."

Chen Yi: "So, you were not the one who killed the person. The two children at the scene were pinched. They can't be right."

Qian Dakang couldn't help but clenched his fist, this time very hard. It was obvious that the middle finger of his right hand could not be fully bent.

"Are you willing to tell the truth?" Chen Yidao.

Qian Dakang was silent.

Chen Yi did not ask a second time, stood up and left the detention room.

Bang!

The detention room door is closed.

Sitting there, Qian Dakang sighed. As a father, even if he knows it may be useless, he must try.

In his early years, his son was admitted to the ICU because of himself, which he would never let go of for the rest of his life.

He owed his son, and he hoped to do his best to make up for it, even if the cost was unbearable... he would not hesitate.

Unfortunately, the police are not fools, and Chen Yi is even less likely to let him get away with it.

Back in the meeting room, Chen Yi told Lu Zhengkai about his discovery, and the latter was shocked. This meant that there was evidence that Qian Dakang was not the murderer of Ji Jingfu's family of four.

"Captain Chen has a keen eye for observation. In this case... Qian Yu is the murderer, but why? Why did he kill Ji Jingfu's family? Is what Zhang Menhai said true?" Lu Zhengkai was puzzled by Qian Yu's motives.

Chen Yi denied: "No, I think Qian Yu is no longer a normal person. He was beaten and hospitalized that year, which may have caused him irreversible and huge damage.

I have asked someone to go to the hospital to get the information. Fortunately, the investigation was quick, otherwise there might be more bloodshed in the future."

Lu Zhengkai said seriously: "Is this the beginning of the serial case?"

Chen Yi nodded: "Yes, Qian Yu and Ji Jingfu's family have no grudges. We can analyze the motives of serial killers.

First, psychological motivation. Domination, manipulation and control of others are common psychological motivations of serial killers. They get psychological satisfaction through crimes and lack sympathy and moral concepts.

Second, social motivation. Due to family or social factors, the murderer embarked on the road of revenge against society.

The third is cultural motivation. For example, the murderer was influenced by movies and TV dramas, which led to the murderer's imitation. Such murderers generally have histrionic personality disorder.

Finally, it is disease or external injury, which is more in line with Qian Yu's situation, what kind of harm did the beating incident in his early years cause to Qian Yu, we need to find out, so I asked someone to retrieve the surgical data. "

Lu Zhengkai completely agreed with Chen Yi's words: "It's reasonable. A person can't become a madman for no reason. There must be a major change in his life. Since it is rape and murder, is it related to his sexual ability? It leads to extreme psychological distortion. "

Chen Yi thought about it and guessed: "Maybe, but it doesn't seem like it. Qian Yu is an adult and a college student. If he killed someone because of his sexual ability, I think his girlfriend should die first. "

Lu Zhengkai thought of other cases: "It makes sense. Similar murders have happened in other cities before. A man and a woman had a one-night stand and checked into a hotel. The man killed the woman because he was ridiculed by the woman. This is a great insult to men. "

It is said that men can be said to be poor and ugly, but they can never be said to be incompetent. This is the bottom line that men cannot accept.

Chen Yi: "The most important thing is that the child was not spared, and Qian Yu's condition may be even more serious.

Let's study the medical records first, and then meet this person in person.

Also, Qian Dakang obviously knows something. How did he know? It can't be that Qian Yu took the initiative to tell him, right?"

Lu Zhengkai recalled Qian Yu's movements on the day of the incident.

He went to his grandmother's house first, slipped away and killed Ji Jingfu's family of four, and then slipped back, and didn't leave until nine o'clock in the evening to return to his own home.

When the investigation team found the repair shop, the surveillance was broken at this time, and Qian Dakang acted quickly.

This shows that Qian Dakang may have noticed Qian Yu's abnormality on the night of the incident, so he quickly arranged everything before the police and disrupted the police's direction of handling the case.

So, how did they judge Qian Yu's abnormality? Normal logic, Qian Yu would not take the initiative to tell Qian Dakang that he had killed someone.

"Either there was blood on his body, or he took the tools of the crime home." Lu Zhengkai speculated.

Chen Yi hummed: "Qian Dakang's home needs a second inspection."