The criminal police took photos of the rental house and came back, the rental house was very well decorated, but there was only one room. The room was very small, and there was nothing in it except a bed and a table by the window, and it could be seen that this rental house was indeed used by Hong Jie to rest temporarily.

But then the question arises, why fruit knives and hemp rope were found under the bed in Hong Jie's rental house. Wen Ning immediately asked people to ask Hong Jie, and Hong Jie honestly admitted that he bought these two things, the fruit knife was bought and had not been used yet, so that he sometimes had to eat fruit to prepare, and the hemp rope, he said that sometimes he had to use it to tie things.

Wen Ning: "Professor Li, do you think Hong Jie will be the murderer?" ”

I nodded: "If our previous reasoning is correct, the four dead should be murdered by Hong Jie and Zeng Rui." "I didn't say it to death.

In terms of criminal motives, the four deceased discovered Zeng Rui's disgraceful affairs, and from the characteristics of the suspects we analyzed, Hong Jie sold ghost books, Zeng Rui had the opportunity to contact the deceased and the identification center, and had professional knowledge of trace identification. Taken together, it is very likely that the two of them are murderers, but we still lack the process of their crimes and the direct evidence to convict them.

I looked at the hemp rope and fruit knife on the table, thought about it for a while, and finally came up with what they might be used for. Assuming that Zeng Rui and Hong Jie were really murderers, Zeng Rui called Hong Jie to confirm whether it was safe, and Hong Jie must have been worried. I think of what Zeng Rui said when he called Hong Jie.

Zeng Rui said that she couldn't get out, which shows that Hong Jie asked Zeng Rui to go out of the police academy. Hong Jie and Zeng Rui were together, it was impossible not to know the rules of the police academy, but he still let Zeng Rui go out overnight, which was obviously problematic. Seeing the fruit knife and hemp rope again, I thought of a possibility, Hong Jie wanted to kill people.

Wen Ning listened to it and felt that it made sense.

Wen Ning: "If you really want to kill people and kill people, Zeng Rui is not wary of Hong Jie, the fruit knife is enough, why use hemp rope?" Do you want to tie Zeng Rui up first? ”

I nodded: "Possibly, seeing the hemp rope, I think I understand why the three girls who died in the farmhouse did not leave traces of struggle." ”

Speaking of which, all the detectives put aside their work for the time being and set their eyes on me. I believe that Hong Jie only played the role of conspiracy or instigation in the course of the case, and that Hong Jie provided assistance after the preparation of the crime and the conclusion of the crime.

Zeng Rui should be the only one who really committed the crime. Zeng Rui has professional knowledge of trace science and forensic science, and if she is calm, it is not difficult for her to leave no traces of crime at the crime scene. But Hong Jie is different, he went to the scene, not to mention whether he could help, he might also accidentally leave traces of his identity at the scene.

If Hong Jie wants to kill people, he definitely doesn't want others to find out. Recently, the Bixian case has been rumored, and even the police are helpless, and Hong Jie, who does not have professional knowledge, wants to kill people, and is likely to learn from Zeng Rui's way of killing. After the death of the four girls, almost no one knows the news that Zeng Rui and Hong Jie are together, and if a similar case is added, it is likely to cause greater interference to the police, making this case a headless case.

"Professor Li, we don't understand what you mean, you said for a long time, and you didn't say how the three dead people were killed without struggling." A criminal police officer asked.

I pointed to the hemp rope on the table: "I think that the deceased may not be unable to struggle, but there is no way to struggle." ”

Wen Ning suddenly realized: "You mean that the deceased was tied up before he died?" ”

I nodded, the palms and soles of the three deceased had been amputated from the wrists, and although the wounds were fairly smooth, the traces of the bindings on them would be difficult to identify due to congestion and corruption. If Zeng Rui was really the murderer, she could persuade the four girls to play a game that invited pen fairies, and it would not be difficult to coax three of them to tie their hands and feet on the pretext of playing other games.

It can be said that the four girls are completely obsessed with this kind of thing, and they are timid, so the purpose of playing this kind of game is definitely not to see ghosts, but to believe that asking the pen fairy can achieve some kind of purpose for them, such as asking about their future.

It is precisely because of this that they dared to go to the farmhouse to invite the pen fairy, to dig up the corpse mud, and the fourth girl dared to go to the tombstone alone. The murderer wanted to deliberately create a situation where the fourth girl committed suicide after murder, so the fourth girl deceived away from the crime scene to copy the tombstone, and the villager in the village saw it should be the fourth girl, and the small thing she was holding in her hand should also be the pen and paper used to copy the tombstone.

There is a distance between the grave in the back mountain and the farmhouse, and the girl walks slowly, and there is no lighting tool, and the girl is a little timid in her heart, so she walks even slower at night, which creates enough time for the murderer to kill and destroy the body. After coaxing the three girls to tie their hands and feet, the killer quickly plunged a pen into their throats.

The cause of death of the three deceased was a wound to the throat, which is a very fragile part of the human body, the trachea and arteries were punctured, and it was difficult for the perpetrator to make a sound if he wanted to scream, and the distance between the farmhouse and the residential house in the village was relatively far away, even if the girl screamed before she died, no one else might be able to hear it. After the death of the deceased, the murderer amputated the bound hands and feet of the deceased, creating the illusion that the deceased was not struggling, which may also explain why the murderer made the unnecessary act of taking away the stump of the body.

The owner of the farmhouse was woken up by the sound of a dog barking, and the dog in the village may have barked after discovering the murderer. After the murderer killed the three deceased, he went to the back mountain to find the fourth girl, the girl was not wary of the murderer, so she was directly stabbed to the heart and died, and then, the murderer put the fruit knife and pen used in the crime at the scene, and left the stump there, creating a scene where the fourth girl committed suicide in fear of crime.

I put on medical gloves and picked up the hemp rope: "Hong Jie wanted to use the same method to kill Zeng Rui and confuse the police, so that the fact that he had co-murdered people would be covered up." ”

Hong Jie asked Zeng Rui to leave the police academy at night, there must be something important, and if you contact these two things, Hong Jie may indeed want to kill people. Of course, Hong Jie will definitely not choose the location of the murder in a rental house, so as not to arouse suspicion.

By the time we finished our analysis, it was already dawn, and the three waves of criminal police who had been investigating outside had also returned. One of them went to find out the owner of the rental house, and the criminal police questioned them, and they said that they had not come back after the rental house was rented, so they didn't know what had happened, and the police directly ruled out the two people from suspicion.

These criminal policemen also went to find the address given by Hong Jie overnight, and Hong Jie did rent houses in many places.

The second wave of criminal police went to investigate Hong Jie's family situation, and through the investigation, the police found that Hong Jie had frequent activities in the business district of City B, and had a seemingly harmonious family in the eyes of outsiders. Hong Jie's reputation is very good, and when it comes to Hong Jie, many people praise him again and again.

It is precisely because of the good reputation that many people are willing to talk about business with Hong Jie, but everyone doesn't know about Hong Jie and Zeng Rui. In this way, Hong Jie and Zeng Rui's criminal motive for killing people is more sufficient.

The third wave is to investigate whether Zeng Rui has an alibi. According to Zeng Rui's father's statement, the police found those friends who went to Zeng Rui's house to find Zeng Rui to hang out that day. Everyone said that Zeng Rui suggested the outing, but not long after they set off, Zeng Rui left on the grounds that there was something temporary at the police academy.

Everyone understands the peculiarities of the police academy, so they don't think much about it.

Hong Jie's confession to the police, he was with Zeng Rui on the day of the crime, perhaps this was to confuse the police, but Hong Jie still underestimated the police's ability to trace the source. In this way, Hong Jie and Zeng Rui did not have an alibi, coupled with the motive for the crime and the consistency with the characteristics of the suspect, Wen Ning and I have basically determined that the two of them are the murderers of this case.

Wen Ning was not excited by this, he said that I reasoned a lot of things, but if you want to convict Zeng Rui and Hong Jie, it is useless to rely on reasoning, we need substantial evidence. Seeing Hong Jie's unflustered appearance, he was afraid that he had already confessed to Zeng Rui, and was ready to die and not admit it.

"I have a way." I said to Wen Ning.