Wen Ning told me that he and another detective followed the girl all the way back to the police academy, and they had already found out the girl's information and the location of the dormitory. The girl's name is Zeng Rui, and she lives on the same floor as the four deceased, but they are far away, Zeng Rui lives in the innermost dormitory on that floor, and the dormitory of the four girls is in the middle of that floor.

Zeng Rui and the four deceased studied the same major and were assigned to the same trace teaching class. Zeng Rui's information is basically consistent with the characteristics that we deduced before, so when I went to You Lu's art exhibition, Wen Ning investigated Zeng Rui through various channels.

Zeng Rui and the four deceased did not have frequent contact and usually only met during class hours, and it is said that Zeng Rui and the four deceased barely spoke. Zeng Rui is introverted, except for the time for classes and physical training, Zeng Rui generally does not go anywhere, and even stays in the dormitory when the police academy stipulates that she can go out of the police academy.

Unless the necessities of life are used up, Zeng Rui will go out of the police academy once. After attending the police academy, Zeng Rui's roommates often asked her to go out for a stroll together, but Zeng Rui refused, and slowly, the other three girls in the dormitory stopped paying attention to her. In everyone's eyes, Zeng Rui is a girl with a withdrawn personality.

Wen Ning speculated that such people are prone to psychological problems, and if there are external factors, they can easily become criminals. Wen Ning asked me what I thought, I thought about it carefully, and suggested that Wen Ning could list the girl as a suspect, but don't disclose it to anyone until he has direct evidence, the reason is still that, the police don't have the evidence that can directly convict him.

In my opinion, there is a high probability that this girl is the murderer. Some of the clues we found today are almost identical to my previous assumptions. Zeng Rui lived on the same floor as the four girls and took classes in a teaching class, so she had the opportunity to grasp the psychological trends of the four girls, and she was also able to contact the identification center and take out the special identification bag. If my guess is correct, the man the girl went out to meet is the one who sold ghost books to the flyover vendors.

After Wen Ning and I followed Zeng Rui, the criminal police who stayed near the gate of the police academy said that after we left, no suspicious people came out. At that time, most of the police academy students left the police academy one after another. The criminal police of the wide net plan followed many suspected targets, but the targets they followed were all normal, either simply wandering around, or returning to the police academy after shopping.

Compared with others, Zeng Rui's behavior is strange.

First of all, there is a problem with the time of Zeng Rui's trip, if Zeng Rui has made an appointment with a friend or object, the time should not be chosen at that time. At that time, when traveling, it is likely that you will not be able to catch up with the time stipulated by the police academy to return to school, and the police academy has strict management, and once you make a mistake, you are likely to be punished or even punished. Wen Ning thinks that if Zeng Rui is really the murderer, judging from her calmness when she killed someone, Zeng Rui is likely to have been observing in the police academy for a long time, and it was not until I asked those plainclothes policemen to pretend to evacuate that she found a chance to come out. Of course, Wen Ning did not rule out that Zeng Rui only needed to go out temporarily, just in time for me to let the plainclothes police evacuate.

Secondly, according to Wen Ning's investigation, Zeng Rui does not often go out of the police academy and is an introvert, but she went out of the police academy today not to buy necessities, but to meet a man.

Wen Ning nodded, and asked people to continue to investigate Zeng Rui, he focused on the period before and after the girl's death, to see if he could find flaws in the girl's reaction. Wen Ning analyzed for a long time, but failed to analyze the criminal suspect Zeng Rui's motive for the crime, which is one of the doubts, if Zeng Rui is really a murderer, then why did she kill four girls she doesn't often contact.

Wen Ning had already taken this into account, and he specially investigated whether Zeng Rui had quarreled with the four girls, but those who were secretly questioned by Wen Ning said that whether it was Zeng Rui or the four girls, their tempers were quite good, and they had very little contact, let alone quarrels, at least they had never seen each other.

We discussed, it was already late, Wen Ning asked me to go back to the unit first, and he continued to stay in the task force office to work overtime. I thought as I walked towards the unit. Regardless of whether Zeng Rui is a murderer or not, there is one problem that cannot be avoided, that is, the direct evidence that is directly used to convict the case.

Zeng Rui has been listed as a criminal suspect, but if she does not admit to death, the police have no way to hand her over to the procuratorate for prosecution based on our current evidence and speculation. In my opinion, the difficulty in this case is not to identify the suspect, but how to find evidence to convict the suspect, and to investigate how the murderer killed the four girls without leaving traces of himself without the deceased struggling, and faked the false appearance of the scene of the suicide in fear of crime.

I thought about it all night and didn't figure it out, Xu Yi was lying next to me, and she saw that I was thinking about things, so she didn't dare to disturb me. At dawn the next day, I rushed to the office again, I thought about it, and decided to enter the girls' dormitory to inquire one by one under the pretext of asking and investigating again, so that I could contact Zeng Rui directly.

When I arrived at the office, Wen Ning was on the phone, and he was on the phone for half an hour. After putting down the phone, Wenning told me the latest progress of the investigation. Although there was no clue at all about the man Zeng Rui went to see, the police found out more information about Zeng Rui.

About two months ago, Zeng Rui began to go out of the police academy more frequently than before, and more than a month ago, Zeng Rui had a serious illness, and at that time, Zeng Rui's roommates were frightened. Zeng Rui's face was pale, lying on the bed and grinning, everyone persuaded Zeng Rui to go to the hospital or the school's infirmary, but Zeng Rui refused, and said that she would rest for a while.

During that time, Zeng Rui took a leave of absence and did not participate in any physical training. Zeng Rui's pale face lasted for two whole weeks, but despite that, she would still go out of the police academy alone. Her roommate was worried about her and asked her not to go out, but Zeng Rui said that she went to the hospital alone and did not let her roommate accompany her.

Wen Ning also investigated Zeng Rui's family, Zeng Rui's family conditions are very good, he lives in City B, his father is a middle school teacher, it is said that Zeng Rui has been strict with Zeng Rui since he was a child, and whenever Zeng Rui makes a mistake, her father will punish her, and even beat her less. Zeng Rui grew up in such a strict family, and he was well educated and studied, but he was reluctant to have more contact with others.

On the holiday when the crime occurred, Zeng Rui went home, but through investigation, after Zeng Rui went home, he made an appointment with his friends to go out to play, and it was not until the last day of the holiday that Zeng Rui went home again to pack his luggage and go back to the police academy. As Zeng Rui grew older, Zeng Rui's father was much looser, but he wanted her to communicate with her friends, so Zeng Rui's father didn't care at the time. Wen Ning directly talked to Zeng Rui's father, Zeng Rui's father said that he also knew those friends, and those friends came to pick up Zeng Rui in person.

Wen Ning wrote down the identities of those people and sent someone to inquire.

The police found Zeng Rui's father, he lost his temper, saying that Zeng Rui had made any mistakes, Wen Ning made an excuse, saying that it was just a murder in the police academy, so the police routinely investigated the classmates one by one. I asked Wen Ning to investigate where Zeng Rui's time was, and if there is an alibi, then the inference that she is the first murderer of the murder may have to be overturned.

Wen Ning and I went into the girls' dormitory, and in order not to cause panic, we didn't bring anyone else. Our target was mainly Zeng Rui, but we still asked about the past from dormitory to dormitory. Since there were no classes, most of the people were in the dormitory, and everyone said the same thing as before.

We also asked about the two girls who were frightened, and the two girls were very grateful to me and Dr. Liu, and now that I think about it, everything was scared of myself.

As we passed by the door of the deceased's quarters, we pushed the door open and went in to have a look. No one lived in the dormitory for several days, and the students who came and went looked at the dormitory from a distance, and the psychological shadow left by this case was not small for everyone.

Finally, we inquired about Zeng Rui's dormitory in order, Zeng Rui was sitting at the desk reading a book, and our sudden visit made Zeng Rui immediately put down the book in his hand......