I'm not a genius detective

Chapter 117 Suspect Yu Dahai (Two chapters combined)

Two days later.

The continuous investigation has lasted for 48 hours, and the scope has now spread to neighboring cities, but the pace has slowed down significantly.

No suspicious persons were found in Qingchang City.

The task force considered whether, if the profile was basically correct, it was possible that the case was similar to the one in Weijiazhuang Village, where, like Cao Kexuan, there was no report of an unnatural death.
It's possible, but impossible to investigate, and it's an extremely low-probability event. If it happens, there's nothing we can do. The investigation should first cover the high-probability events.

All the officers in the First Squadron barely slept for two days, at most taking a short nap before forcing themselves to stay awake and work again after opening their eyes.

Working overtime without clear leads can cause some people to feel a little resentful, since criminal profiling is, to some extent, no different from guessing, and they worry about doing useless work.

No matter how high and mighty Yin Yunliang is, he is just an ordinary person, not a god. As a human being, he will make mistakes.

Today, Han Ling and his three colleagues went on a business trip to Yifeng City. The letter of assistance has been sent, which is the key to launching the investigation. However, the feedback from Yifeng is not very positive, and the task force must go there in person.

That's understandable. They have their own cases to handle and are usually too busy to deal with other cities' requests for assistance.

If it's just about participating in arrests, that's fine. They can't really take large-scale investigations too seriously. At most, they can just assign a few officers to check the situation. That wouldn't meet the expectations of the Gu'an Branch's task force in terms of efficiency.

In this situation, Ji Bowei had to arrange for someone to go to Yifeng City to improve the efficiency of the investigation.

"Han Ling, do you know how accurate your profiling really is?" Tong Feng asked on the way, his eyes were dark from the case, and he looked exhausted.

Upon hearing this, the other two colleagues in the car also listened intently. They had wanted to ask before, but they were too embarrassed to speak up because the other person was a student Yin Yunliang had just taken on, so as not to cause any misunderstanding.

Han Ling said, "The probability is high, but there is also a chance of error."

Tong Feng was not satisfied with this answer: "How high is 'very high'? Is Professor Yin really confident?"

The task force obtained mostly profiling results, but their understanding of the process was not very thorough. What sounded reasonable was not the case when investigated. Only Yin Yunliang himself or Han Ling knew the truth about this matter.

"We wouldn't have conducted the investigation if we weren't confident," Han Ling reiterated. "There's always a chance of making a mistake, so we need to be mentally prepared. Even if it turns out to be negative, it's still a gain. Even without this profiling, didn't we often try and fail when investigating cases before?"

Tong Feng nodded slightly: "That's true."

Criminal investigations lacking clear leads are essentially a process of trial and error; the more you try, the closer you get to the truth.

After a few casual words, Tong Feng and his two companions perked up and realized that they had been too focused on the correctness of the investigation direction and had overlooked the fact that trial and error is a daily routine for criminal police officers.

Upon arriving at the Yifeng Municipal Bureau, the group immediately began working, starting from the jurisdiction of each branch bureau and radiating outwards to the county bureau, repeating the work they had done in Qingchang.

Another all-nighter has passed.

A branch of the Yifeng Public Security Bureau.

Tong Feng treated everyone to a meal, bringing out a case of Red Bull. He used external forces to overexert his body and search for the suspect's trail in the vast crowd.

"Han Ling!"

"Come here!"

My colleague seemed to have made a discovery, and his voice became much louder.

Upon seeing this, Han Ling, who was reviewing the files, quickly got up and came over. Tong Feng and another colleague were also drawn to the scene, and the three of them gathered around the computer.

"Doesn't this girl perfectly fit our screening criteria?" a colleague asked, pointing to the computer screen, which displayed the case file of a local girl from Yifeng.

The information is very detailed, including not only basic information but also details about her interpersonal relationships, personality, spending lists, and online chat logs. It is clear that the Yifeng Branch has launched a comprehensive investigation into the girl in order to investigate this case.

Ultimately, the Criminal Investigation Brigade of Yifeng Branch investigated the possibility of homicide and determined that the girl died by suicide. The motive for suicide was infection with the HIV virus, commonly known as AIDS.

The girl's name is Yu Youyi, which is a nice name.

"Three years ago, she jumped into the river and committed suicide?" Tong Feng saw four familiar words. "In Dai Bin's novel, the female supporting character Xiao Yu also died by suicide by jumping into the river. However, Xiao Yu's motivation came from emotions, while Yu Youyi's motivation came from the blow of illness."

Novels always involve artistic embellishment; in reality, very few people commit suicide because the person they love is getting married.

If it's due to illness, that sounds relatively reasonable.

Nowadays, with the continuous advancement of medicine, AIDS is no longer a terminal illness in the traditional sense. Lifelong medication can allow people to live a long time like normal people, and if they are lucky, living to seventy or eighty years old is not a problem.

During this period, at most, problems such as drug side effects and drug resistance will be encountered.

However, the word AIDS carries a lot of prejudice in society. People who are chaste and have a high probability of contracting AIDS are extremely low. It is more common among same-sex couples or those with promiscuous private lives.

Looking at the information on the screen, the colleague said, "Judging from her daily experiences and spending records, Yu Youyi's private life is very messy. She spends more than 20 out of 30 days a month in bars and nightclubs. She has tattoos covering 40% of her body and has improper relationships with multiple men."

Tong Feng said, "Putting aside the romantic relationship, Yu Youyi is quite similar to Xiao Yu, even their methods of suicide are the same. Could it be her?"

Han Ling: "Just check her father and you'll find out."

A colleague used the computer to retrieve information about Yu Youyi's father.

Yu Dahai, 52 years old, was a tenured mathematics teacher at a public school. He later left his job to join a private school, and after leaving again, he entered a tutoring institution.

It was common in earlier years for teachers to give up their permanent positions to work in private schools, because the salaries of permanent teachers were very low at that time.

In the 1980s, the monthly salary of a tenured teacher was only a few dozen yuan, while that of a private school teacher could reach two hundred yuan, a difference of several times. This led many teachers to resign and join private schools in pursuit of higher salaries.

At the time, no one realized the stability and importance of being a tenured teacher, nor did they realize that teachers' salaries would increase so quickly, and that there would be high retirement pensions. It wasn't until private schools started laying off staff and closing down that they woke up, but it was too late.

Han Ling took out the portrait and compared it with Yu Dahai's photo. The two were quite similar, except that the beard was clean and the facial features were basically the same.

"I'll contact Brother Zhou right away."

Han Ling did not report to her superiors directly. Instead, she called Fang Zhou to explain the situation. Fang Zhou then contacted Hu Lihui, who in turn notified Ji Bowei.

Yu Dahai's information was quickly opened within the task force.

Finally, there has been a breakthrough.

After discussing with Hu Lihui, Ji Bowei determined that Yu Dahai was probably the person they were looking for, and immediately arranged for someone to apply for mobile phone location tracking at the Municipal Bureau.

At this point, it is crucial to first determine the location of the ocean; contact must not be made rashly.

If Yu Dahai is the murderer of Dai Bin, his reaction to the police call would most likely be to flee.

In Yifeng City, Han Ling and his three companions received orders to remain on standby and temporarily suspend their investigation.

If the suspect is indeed Yu Dahai, Qingchang and Yifeng are the two cities he is most likely to stay in. Once the location is confirmed, bring him back directly.

"Did you find it?" A colleague from the Yifeng branch asked as the four stopped working and prepared to leave.

Tong Feng nodded: "It should be right. We believe that Yu Youyi's father, Yu Dahai, is a major suspect in the suicide of Yu Youyi three years ago."

The letter of assistance clearly stated that there was no need to hide it from the colleagues at Yifeng, as they were there to help with the investigation and the information they obtained was basically the same as that of the task force.

“Yu Youyi…” A colleague from the Yifeng branch thought for a moment and remembered, “Oh, that girl, I remember her. After being diagnosed with AIDS, she didn’t keep it a secret, and her relatives and friends all found out. She couldn’t bear the pressure and ultimately chose to jump into the river and commit suicide.”

Upon seeing his daughter's body, the father, Yu Dahai, nearly collapsed and jumped into the river. He had divorced early in his life and raised Yu Youyi alone for many years. Because he was busy with work and had little time to care for his daughter, Yu Youyi lacked proper guidance in developing her values. During her middle school years, she associated with delinquent youths and did not attend university.

Tong Feng: "It's quite rare for a teacher's daughter not to go to university."

A colleague from the Yifeng branch sighed, "Divorced families are quite harmful to children. Yu Dahai only cares about work and doesn't spend time with his daughter, ignoring the changes in her adolescence. There's nothing we can do about it."

Girls need their mothers' companionship during puberty; there are many things fathers can't help with, so they have to let go.

Tong Feng didn't talk to the other party for long. After exchanging a few words, he left to get some fresh air.

In the courtyard, those who smoked lit cigarettes. Tong Feng and his two colleagues couldn't hide their astonishment. One of their colleagues couldn't help but say, "This is too accurate. I never thought that a girl like Xiao Yu really existed. It feels like Professor Yin has a God's-eye view."

People still rely more on traditional criminal investigation methods when solving cases, such as sitting in an office and directly identifying suspects through analysis. Such scenarios only appear in TV dramas.

Reality is harsh and full of uncertainties. What the police believe and what the suspect actually does are often very different, because individuals are different.

Unexpectedly, this time, based on Yin Yunliang's profile, they were able to find a girl who met the criteria after investigation, and directly identify the suspect as Yu Dahai.

Is criminal psychology really that amazing?

Tong Feng looked at Han Ling: "If you learn it in the future, will you be this good too?"

Han Ling said, "Criminal profiling is only an auxiliary means. Finding Yu Dahai this time was partly due to luck. Normally, we still need to rely on solid clues and irrefutable evidence when investigating cases."

Of course, mastering profiling skills will definitely be helpful in criminal investigations. Integrating it throughout the investigation process, it helps investigators choose more accurate directions and increases the probability of solving cases.

Hearing this, Tong Feng felt a little better. If solving cases relied entirely on profiling in the future, how many police officers would lose their jobs? Experts like Yin Yunliang are, after all, a minority.

……

The phone location data came back quickly, and Fangzhou called Han Ling.

"Hey? Brother Zhou?" At this moment, Han Ling and the other three were still outside enjoying the breeze to relieve their physical and mental fatigue.

They could actually get some sleep and rest, but now that the suspects have been identified, they can't sleep.

Fang Zhou said on the phone, "Yu Dahai is in Yifeng. The signal range shows that he is at home. You and your colleagues in Yifeng should work together to bring him back immediately."

Han Ling: "Yes."

After hanging up the phone, the four returned to the branch office and found the deputy captain of the criminal investigation team. After explaining the situation, the deputy captain arranged for two people to assist them.

The two police cars quickly drove away from the Yifeng Precinct.

Yu Dahai's residence was within the jurisdiction of the branch office, not far away, only a dozen minutes away. When the six people got out of the car and arrived at the gate of the community, it was 11:30 a.m.

During rush hour and mealtimes, there are many pedestrians and a considerable amount of traffic.

"Please block the entrance in the courtyard, we'll go to the main gate," Han Ling said to his colleagues at the Yifeng branch.

Yu Dahai lives on the first floor, and the first floor of this residential complex has a yard, so the other party may be able to escape.

"it is good."

The two colleagues from the Yifeng branch were both under thirty years old, very young, and they had no objections.

Assisting in the arrest is simply a matter of fulfilling one's duties and following the instructions of the Qingchang police; any problems that arise are not their responsibility.

The action begins.

The four arrived at Unit 3 and, listening to the sounds, realized that the resident of Unit 102 was cooking, and that Yu Dahai was at home.

Han Ling entered the building and knocked on the door with great force, because the sounds from the kitchen would mask the knocking.

After knocking for about ten seconds, the kitchen range hood seemed to stop. Han Ling continued knocking, and at this moment Yu Dahai finally realized that someone was knocking on the door, so the footsteps came closer.

"Who is it?" Yu Dahai didn't open the door immediately, but asked for the person's identity first.

Han Ling: "Hello, this is the property management. We're checking for safety hazards in the community. It won't take too long."

After a moment of silence, Yu Dahai suddenly asked, "Where is the property service center located?"

Han Ling and the other three exchanged glances. The other party was much more vigilant than they had imagined, which indirectly meant that... this guy was suspicious.

In a society governed by the rule of law, a normal person would not doubt the identity of the property owner.

inside the room.

Yu Dahai waited for three seconds. Seeing the person outside the door remain silent, his expression changed slightly. Without hesitation, he took off his apron, grabbed his wallet and phone, put on his shoes, and left.

Upon arriving at the courtyard, he quickly pushed open the gate to leave the community. Just then, two police officers from the Yifeng Branch suddenly appeared and swiftly tackled him to the ground.

"Criminal Investigation Division, don't move!"

The handcuffs were stuck on Da Hai's wrists.

One of them contacted Han Ling and the others, and the four of them quickly stood in front of Yu Dahai after going around in circles.

Looking up at the sea.

There are indeed differences between his appearance and the portrait, but the similarities can still be vaguely discerned. He still has a beard on his face, and his hair hasn't been washed for several days, making him look quite unkempt.

"What's your name?" Han Ling asked, looking at him.

Yu Dahai looked puzzled: "Officer, have you arrested the wrong person? I stay at home every day and rarely go out. I haven't done anything."

Han Ling: "I asked you what your name is!"

"Yu Dahai".

Han Ling: "You just got back from Qingchang, right?"

Upon hearing this, Yu Dahai's gaze flickered violently, and he said, "I have never been to Qingchang."

"Let's talk back at the station." Han Ling and the others took over control of the sea, and the group left the residential area.

Arresting someone in another location requires going through procedures at the local branch office. After that, the four men drove Yu Dahai back to Qingchang.

Based on the profile, appearance, and Yu Dahai's escape behavior, it can be basically determined that this person is highly suspected of committing the crime, and he should be the one who killed Dai Bin.

Han Ling and his three companions did not exchange a single word on the way, and Yu Dahai did not speak either. The two sides returned to the Gu'an District Branch of the Public Security Bureau in Qingchang City in silence.

Meanwhile, Ji Bowei met with Zhao Xingbang and reported the situation. Zhao Xingbang then coordinated the issue of cross-regional cooperation. The search of Dahai's house was entrusted to the technical squadron of the Yifeng City branch. The search results were communicated via electronic and telephone.

Yu Dahai was taken into the interrogation room.

Ji Bowen personally took charge of interrogating Dahai. Based on the evidence currently available, it was insufficient to pry him open his mouth; it all depended on his psychological resilience.

"You like reading novels?"

Ji Bowen looked through Yu Dahai's phone and found the novel app that Dai Bin used, as well as Yu Dahai's reading history.

I didn't expect this guy to be so forward-thinking. He's over fifty years old and he's already using a smartphone to read novels. He's at the forefront of technology.

Yu Dahai remained silent.

"Do you know Dai Bin?" Ji Bowei continued to ask.

Yu Dahai remained calm and shook his head.

Ji Bowei: "You said you haven't been to Qingchang recently, right?"

Yu Dahai: "I have never been here before."

Ji Bowei: "Four taxis, all four drivers have seen you. Do you think lying will work?"

Upon hearing the word "taxi," Yu Dahai shifted his gaze and lowered his head slightly.

Ji Bowei picked up another piece of paper: "Footprints were left at the scene of Dai Bin's murder. We have already compared them, and they match the size of your footprints. If these shoes haven't been thrown away yet, the Yifeng police will be able to find them immediately."

"Yu Dahai, I must remind you, we wouldn't have brought you from Yifeng to Qingchang without being absolutely certain. Our Gu'an branch went to great lengths to find you."

Cases involving strangers who commit crimes and leave no evidence at the scene are the most difficult to investigate. Without Yin Yunliang's profiling providing new directions for the investigation, finding the suspect would be like looking for a needle in a haystack.

Yu Dahai said, "I really don't know any Dai Bin. Who is he?"

Ji Bowei picked up his phone: "The author of the novel you are reading is also the creator of Xiao Yu."

Yu Dahai looked stunned, his tone becoming agitated: "You mean, I killed the author? Why would I kill him! I didn't even know him!"

Ji Bowei scoffed: "You may not know the author or Dai Bin, but you must know Xiao Yu, right?"

“Xiao…” Yu Dahai’s voice faltered. “Xiao Yu is a character in a novel, not a real person.”

Ji Bowei: "But your daughter Yu Youyi, don't you think she and Xiao Yu are very similar in some ways?"

Yu Dahai's eyes twitched.

Ji Bowei, focusing on attacking the mind, continued, "Xiao Yu is the daughter you fantasize about. In reality, your daughter is vastly different from Xiao Yu. Putting aside everything else, the phrase 'self-discipline' is completely unrelated to your daughter."

Throughout the entire novel, Xiao Yu never had any improper relationships with any men, yet your daughter contracted AIDS as a result, which was the reason for her suicide.

After listening, Yu Dahai's face began to flush, an outward manifestation of his rising anger and his desperate attempt to suppress it.

When a suspect is emotionally distressed, the interrogation process can be conducted more effectively.

……

P.S.: I will continue writing the extra chapters and bonus chapters for monthly votes tonight. The time is uncertain, so please don't wait, it may be very late.

(End of this chapter)