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The case that Liu Yusheng talked about is very coincidental, and Yuan Yaxian has also studied it. This is a very classic case, the deceased died in the house, all the doors and windows were locked from the inside, and the only way for people outside to enter was to break the doors and windows.

Three days after the deceased's death, the neighbor felt that something was wrong and called the police, who later concluded that the deceased had died by suicide. The police's judgment cannot be said to be unreasonable, there is no trace of the existence of a second person in the closed room, all the doors and windows are locked from the inside, the people outside cannot enter, and the people inside cannot come out without destroying the doors and windows, so there is only the only explanation for the suicide of the deceased.

At that time, the deceased had no relatives and no reason, and if he died, he died, and no one felt that there was anything wrong with the case ending like this. Until one day, a year later, a drunk man got drunk and went around the streets to proclaim that he was a murderer, and he said that he had created a closed room murder.

The funny thing is that people thought that the drunk was talking drunk, so they ignored him, and then the drunk sobered up and fled. A detective noticed this, and he thought it was strange, so he looked through the file again and tracked down the drunk, who happened to be the neighbor of the deceased.

Finally, after some investigation, the detective finally finds out the truth. The deceased was indeed killed by his neighbor, who first strangled the deceased, then created the illusion that the deceased had hanged himself, sorted out the traces in the room, and finally focused on creating the illusion that it was "impossible to commit a crime". 【】

The neighbor locked all the windows and left the key in a prominent place in the room, and when he walked out of the room, he began to deal with the door. Because the door of the deceased's house was very strangely constructed, and the neighbor happened to know this kind of door lock very well, he could make the door lock without a key.

Strictly speaking, this case is not very complicated, the neighbor coveted the property of the deceased, and killed people with passion when he saw wealth, but his handling of the deceased's room is the most representative beginning of the closed room murder case. In this case, the sloppiness of the police's handling of the murder and the final outcome of the murderer are not the focus, but the focus is that his modus operandi has created a precedent for the murder genre of "impossible crime".

Liu Yusheng didn't seem to be lecturing at all, he was more like telling a story, and after telling this original locked room murder case, he followed up with a series of more advanced cases of "impossible crimes". Like the Mauger Street Murder, the Canary Murder and the Tomb Mystery, these are all representative cases of "impossible crimes" that are famous all over the world.

When Liu Yusheng told these cases, he was flat and straightforward, without too many ups and downs in tone, and there were not many scene renderings, but there was an inexplicable atmosphere of fear that quietly spread, making the students who listened to the class couldn't help but tremble. Yuan Yaxian sighed, she finally understood why so many people liked Liu Yusheng's class, it turned out that the students were not here to learn things, but to watch horror movies.

After telling a series of horror stories, Liu Yusheng stood in front of the light of the slide, did not let the light on, nor did he let people pull up the curtains, the light of the slide shone a few dark lattices on his face, making him look a different kind of gloomy.

"Seeing this, what questions do students have to ask?" Liu Yusheng said gloomily.

Put a bunch of slides, and then the students have a few random questions, and after Liu Yusheng answers, it is time for the end of class. This is what the famous psychology professor Liu Yusheng looks like in class? Yuan Yaxian couldn't help but feel that she was coming by mistake? How can such a so-called professor really help a serial homicide?

"Professor, I want to ask what you would do if you were to set up a murder case in a closed room?"

A man in the shadows asked, the questioner's face unclear in the dark, and the question he asked was a joke, but his tone was serious.

Liu Yusheng thought for a while and said: "This question is a good question, if we want to really understand criminology, then we have to learn to substitute the psychology of criminals, and it is also a good way to start from the methods of criminals." If I were to set up a murder in a closed room, I would use reverse thinking to create a secret room that is absolutely inaccessible from the outside, and use gas or other factors to kill people, and there are several elements to this......"

Liu Yusheng talked eloquently, Yuan Yaxian listened to it in a cold sweat, she even couldn't help but want to interrupt Liu Yusheng several times, and she wanted to question Liu Yusheng: "What are you doing here?" Teach people to sin? ”

If the criminal method mentioned by Liu Yusheng is strictly followed, Yuan Yaxian knows that the solving rate of this kind of case will be infinitely close to zero! But in the end, Yuan Yaxian didn't speak, because they just gave a lesson, and no one could blame Liu Yusheng in this regard.

If someone kills someone with a knife, and you can catch the murderer, and you can even prosecute the person who sells the knife, then can you also arrest the person who produced the knife?

Although she couldn't stop Liu Yusheng, Yuan Yaxian panicked in her heart, for some reason, after listening to Liu Yusheng's class, she always felt that this person was very dangerous. At this time, someone asked a question, which made Yuan Yaxian concentrate all her attention at once, and put all other thoughts aside.

"Professor Liu, I wonder what you think about the recent serial homicides? There have been five homicides in a row, and the police have not had any clues so far, is the police too incompetent, or is the murderer too cunning? If you're a police officer, how do you solve this serial murder? ”

Listening to the voice, the person who asked this question was still the one who proposed the secret room murder method just now, Yuan Yaxian had no intention of investigating who this person was at this time, she also wanted to know Liu Yusheng's opinion on the serial murder case.

Liu Yusheng was stunned for a moment, as if he didn't expect anyone to ask this question, he thought about it for a while and said: "This case is actually very simple, it's not that the murderer is too cunning, but that the police are incompetent." ”

Liu Yusheng's words were shocking, and his tone was terrifying!

Yuan Yaxian didn't fight anywhere, sneered, and secretly ruthless in her heart: "Arrogant, I want to see what flowers you can say!" ”

The students below were obviously also shocked by Liu Yusheng, and they whispered, as if they didn't believe Liu Yusheng's statement. It's not that I don't believe in Liu Yusheng's ability, it's just that the serial murder case has been going on for so long, and the police haven't found any clues, and they haven't disclosed any clues about the case. Even if Liu Yusheng has some skills, he doesn't know anything about the case, and the information he knows should come from media reports, in this case, what high opinion can he have?

"The direction of the police investigation is completely wrong!" Liu Yusheng's words are not shocking, "The so-called serial murder case must be premeditated, so the selection of the target of the crime must have its own rules......" (to be continued. Mobile phone users, please browse and read, a better reading experience.