As night fell, there were no lights on in the room, and it was dark.

A woman opens the door of the house, "clicks", and the living room becomes bright with the sound of the light switch. This is a three-bedroom house, about 100 square meters, and a family of three documents are hung on the wall.

But the house was deserted, and no one was there. The woman's face was a little tired, she put down the bag she was carrying, and went straight to the bedroom.

The light in the bedroom is not on, but there is a computer inside, and the main light of the computer is on, apparently not turned off, just in a dormant state.

The woman walked over and shook the mouse, and the screen lit up.

Enter the password proficiently, and the desktop is clean. But at this time, a new notebook document was automatically created on the desktop, and some words began to appear in it.

"The police should be looking for you soon."

"I've already looked for it once."

"Didn't show up?"

"Nope."

"Very good, the police's method of handling the case, if they can't find any favorable physical evidence, will only investigate from the interpersonal relationships of the deceased. But they won't find you. ”

"Is this a perfect crime?"

"What kind of perfect crime is this, the police can't find you because the techniques I taught you are clean and clean, and they won't leave any evidence at the scene that directly finds you, it's like, don't know me. But if there is one person who knows of my existence, then he is likely to find you. ”

"Who?"

"It doesn't matter who he is, it's a game I play with him."

"Hehe, I can guess if you don't say it. It's the boy you asked us to fingerprint, and you're playing a game with a student, it's a bargain. And you're still joking with our lives, you should know what it means once we get caught. ”

"Alright, this is over, I will clean up all the conversations and computer traces between us, and from now on, be a widow who has lost her husband with her tail between her legs."

The notebook was suddenly turned off, and then the computer fluctuated like a refresh, and in just a few seconds, the computer shut down and restarted.

When I opened it again, there was still nothing inside.

But the woman knew that the person named Y behind the computer had already cleaned up all traces of him in the computer. Including the original Trojan virus, this computer is no different from the one I just bought.

The woman sat down on the bed in the bedroom in a gloomy manner, her face changed from a little confused, to suddenly became hideous, and then showed a sad look, like a change of face, which was extremely wonderful.

.

.

Lin Ming only learned that there had been a murder in the restaurant after returning home that night. The western restaurant has a membership system, and if you apply for a card once, you will get a 20% discount, Lin Ming opened a card at the suggestion of Li Sisi, left a phone number, and just got home, I saw a call from my uncle.

"Hey, Lin Ming."

"What's wrong, uncle." Lin Ming was still very surprised that his brother-in-law would call, because he usually called to inquire about the case, and then summarized the case to Zhou Yunkai and Zhang Shaoan. Every time he called his uncle, he would look impatient.

He took the initiative to call, and it was the first time.

"You're having dinner at Golden Horn this afternoon?"

"yes."

Lin Ming said strangely: "How do you know." ”

He had dinner with Li Sisi, but it was a temporary idea, and he didn't notify anyone. How did my uncle know? This question still has to be asked clearly, he and Li Sisi's dinner is like a couple dating in the eyes of outsiders, if it reaches the ears of teachers, parents or An Ran, it will inevitably be another trouble.

"The restaurant has the phone number you left." Fang Junlong said: "I saw that you checked out at 5:42 p.m. and left, and by the way, you got a card." ”

"Oh."

Lin Ming was even more strange: "Uncle, you went to the western restaurant to check what you were doing here." ”

"You don't know? While you're eating, the restaurant owner is poisoned and dies in his office in just a few minutes. Fang Junlong said solemnly: "Now we are investigating the people who ate in the restaurant at that time, and if it is convenient, come to the police force to record a statement." ”

“”

Lin Ming was speechless, it had only been a few days, and he had gone to the criminal police team three or four times. After thinking about it, it was such a big night, so I didn't bother to go over, and said directly on the phone: "If it's sure to be poisoned and murdered, it can't be someone in the restaurant, I think it looks like the staff did it." Because I was eating, I heard a scream, and then I saw the staff running to their boss's office. I got up and took a look, and saw that the staff office area was in the innermost part of the cafeteria, and I had to go through the bathroom and then the kitchen to get to the office. If the people who were eating had passed, they would have been discovered. ”

"There's some truth to what you're saying, but have you ever thought about it? 5-6 p.m. is the busiest time for the restaurant, when the seats are full and the staff is very busy. If you go to the bathroom at this time, change into an employee uniform, go to the office area, and then go back to the bathroom to change clothes after being poisoned, do you think anyone will notice. ”

"Well, that's right." After all, Lin Ming is not a professional criminal investigator to solve cases, his logical thinking is not rigorous, and he is still taking make-up classes in mathematics and physics, so naturally he does not have this kind of clear thinking to think about murder methods, if it is Zhang Shaoan and Zhou Yunkai, there will definitely be no such problem.

Fang Junlong said: "Therefore, it is possible for the guests to eat in the restaurant to commit a crime, but the probability is relatively small." Our main suspect is still locked in the restaurant staff. ”

"Why only lock up the staff of the restaurant when it is possible for the guest to commit a crime. And the guest just shouted over to record a confession? ”

"Because we found hydrocyanic acid in the deceased's teacup, it is reported that the deceased's daily work schedule was to work in another company in the morning, wait until about 5 p.m., and return from the company to supervise the restaurant. At 9 p.m., there will be a staff meeting every day before I go home from work. While working in the restaurant, the deceased spent most of his time in the office using a computer to do accounting and had the habit of drinking tea. In other words, the murderer was extremely knowledgeable about the deceased's daily routine and routine, and knew that he would drink tea in the office. So we think it's a good chance that it's a restaurant employee, and we're looking for these people right now. ”

This western restaurant has not installed surveillance, and before 2006, there were no monitoring facilities in many places in China. Even the main road outside does not have a Skynet area, let alone some commercial areas. Therefore, when the police handle a case, they can only use the old method to investigate, that is, to find the motive for the killing.

In our country, almost 95 percent of homicide cases are murders of passion or manslaughter, which are the kind of people who draw a knife and slash people in a fit of rage. It's easy to solve the case and find the murderer.

Once you encounter the kind of case where you can't find a motive, you can't find eyewitnesses, and there are no clues at the scene, it's very difficult to crack.

Like the Silver Case, is the murderer a high-IQ crime?

Apparently not.

But it took the police more than ten years, waiting for the DNA bank and fingerprint database to gradually build up, before they really found the culprit. Therefore, the case in reality is by no means the kind of intriguing thing in the detective, it involves not only the logic of thinking, but also more realistic situations.

The most realistic thing about Hu Jie's case is that except for the useless fingerprint, the scene was cleaned up very cleanly, and not even a single dust could be left. The second is that if you can't find a criminal suspect, you can't even suspect it, so you can't solve the case.

Therefore, Fang Junlong felt that his situation was very bad.

The vicinity of the city center is in Chengguan District, Fang Junlong is less than 30 years old, and he is a full-level criminal police captain in the city center, so he naturally has his ability. Therefore, after receiving the report, he quickly came to the scene, and according to the clues at the scene, he immediately believed that the murderer must know the habits of the deceased very well in order to commit the crime, so he locked the restaurant staff.

However, when he saw Lin Ming in the card list, he couldn't help but call him. In fact, I made this call, not to investigate him, but to knock on the side, how the people behind Zhou Yunkai in the Hu Jie case were investigated.

Because in Fang Junlong's guess, there must be a think tank behind Zhou Yunkai to help him, so he can provide some clues to the police, and he hopes to get help from those people.

Two murders occurred in a row in the jurisdiction, which simply made Fang Junlong feel white. You must know that homicides are not so easy to happen, the security of Yuncheng is not bad, according to the calculation of previous years, there are a total of 5 in the urban area, and there are less than 10 homicides in each district a year, like Chengguan District and Jinfu District, which are two large regions, and the economy is prosperous and the mobility of people is very large, so there are more accidents. For example, Yunxin District, Yuehua District, and Beicheng District are not in the city center, they are relatively close to the suburbs, and the crowd is not as large as the city center, so there are many fewer occurrences. Therefore, the average number of homicides in the city is about 10-50 a year, and the probability and time of occurrence are not fixed at all.

But now that two murder cases suddenly appeared on him, Fang Junlong certainly felt a lot of pressure.

The criminal police brigade of Chengguan District is now busy with the Hu Jie case, and most of the police force must be divided just to check the interpersonal relationships of the deceased. There are only about 30-40 people in the entire criminal police brigade, and there is no way to conjure up a flower, and the two cases are piled up on Fang Junlong's head, so he naturally hopes to find some outside help to help.

Hearing Fang Junlong's explanation, Lin Ming thought for a while and said, "Okay, I understand." I'm not going to the criminal police team tonight, I'll remember when I was eating, the situation in the restaurant, and I'll tell you tomorrow. ”

"Yes."

"Then I'll hang up first."

Lin Ming was about to hang up the phone, but he didn't expect his uncle to be busy: "Wait a minute, don't hang up." ”

"What's wrong?"

"Actually, you won't use it tomorrow, I asked the waiter in the restaurant, you and your little girlfriend have been eating, and they haven't even been to the toilet, so naturally there is no suspicion."

"Uncle just said very seriously that he wanted to investigate all the people who ate in the restaurant, and now he immediately changed his words, he must have something else to ask for, Lin Ming said speechlessly: "Then you called me to the criminal police team and said that you wanted to investigate me?" If you want to ask a question, I'll just say no to you on the phone? Is there something to ask me for? ”

Sure enough, Fang Junlong changed his hippie smile and said, "Hehe, you are my nephew, how can I doubt you?" Actually, I just want to ask, how did Zhou Gongzi's investigation of Hu Jie's case go? What's new? ”

"Progress?" Lin Ming thought for a while and said, "You wait, I'll make a call." ”