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On the TV screen in the school cafeteria, the weather trends around the world were broadcast. On September 9, an airflow was generated on the Northwest Pacific Ocean, and at 10:14, the airflow formed a vortex. The vortex strengthened into a severe tropical storm on September 9, and continued to strengthen into a super typhoon on September 11, named "Molan".The International Typhoon Center predicts that this super typhoon will soon sweep across the Taiwan Strait and land in Haidao City on September 9, with a maximum wind force of 12 meters per second.

All parts of Haidao City immediately issued typhoon warnings, requiring all areas to prepare for typhoons.The Education Bureau issued a notice that from September 9th to 15th and the following Saturdays and Sundays, all schools in Haidao City will be closed.

Every year, typhoons of different strengths and weaknesses land in Haidao City, and students in Haidao look forward to this typhoon-related holiday every year.Students who have not yet realized what a disaster this year will be are rejoicing in anticipation of this holiday season.

From the 12th to the 14th, the Haidao People's Public Security University held classes as usual. The typhoon Moran, which was estimated to be the most powerful typhoon in history, had not yet landed, and it became a hot topic of discussion among teachers and students at the school.

Yin Shun took the crime analysis class this morning. Due to the typhoon as a hot spot, the island serial murder case was once again brought up as a case study.

The homicides in this series occurred before and after a typhoon or rainstorm. The work of preventing typhoon and rain was not as good as it is now. Every time a typhoon or heavy rain passes, it will definitely cause damage to the ground and facilities.Few people will go out two days before and after the typhoon, the murderer chooses to find the target to commit crimes during those days.

In 98, there were three heavy rainstorms in Haidao City, and the murderer committed three cases.

The road is muddy, the ground is covered with water, and the temperature is low. Every outdoor crime committed by the murderer is carried out in such a harsh environment. It can be inferred that the murderer's endurance is extremely extraordinary.

According to uncertain information from an eyewitness in Bohu District in 96, he once saw a suspicious person wandering in the grass field for more than an hour in the heavy rain. Unfortunately, it was too dark at that time and the witness could not see the appearance of the suspicious person clearly.

Apart from the victim’s younger brother in 04, the only witness to the island series case is this one. Because the younger brother of the victim in 04 was too frightened and couldn’t express clearly, he couldn’t provide effective transcripts. So far, the portraits of the prisoners are all from 96. Information provided by eyewitnesses.

In those years, the police searched for the suspect based on the witness's vague description. Over the past eight years, the police included hundreds of suspects on the list of suspects.

Among them, the most suspected person was the administrator of the public toilet in Zhonggang Village in 97.In those days, you had to pay a dime to the administrator to go to the public toilet. In 97, the victim Hua was killed at two o'clock in the morning. At that time, the steel factory was rushing to produce a batch of goods. As the factory director's daughter and the head of the production department, Hua worked overtime in the factory day and night to supervise the workers.

The iron and steel factory didn’t have toilets. If they want to go to the toilet, they have to go to the public toilet outside. In order to save a dime for the management fee of the public toilet, most of the workers find a place in the wild to solve it by themselves.

On the day of the incident, Hua worked overtime until two o'clock in the morning, went outside to use the toilet, and never came back.

The public toilet manager was an old man in his 60s who was still watching pornography in the management office's residence after two o'clock. The police believed that he was very suspicious.But later he was released because of insufficient evidence. Within two years, the old man died, and the murderer continued to commit crimes.

Speaking of this, the professor asked all the students in the seat: "You can deduce, what kind of person is the murderer? What is the motive?"

A female classmate stood up and replied: "The murderer is the administrator, and the motive is robbery. The murderer not only raped and killed the deceased in the public toilet, but also dismembered and reassembled the deceased. For such a long time, the administrator did not notice, maybe ?"

"Of course it's possible!" A male student's voice rang out from among the classmates, "The administrator was in the working residence at the time, but he was not on the job. His residence was at least tens of meters away from the public toilet, and it was still obliquely behind the public toilet. I can't see anyone going in or out of the public toilet. Besides, if a man concentrates on that kind of thing, how can he notice other things?"

All the boys in the class suddenly roared with laughter, which made the standing female students blush.

"Then the administrator is lying. He was not in the working residence at all when the crime happened, or he was watching pornography in the residence and saw his lust, and he wanted to come out to commit a crime. It happened that the deceased was hit by the gun!" the female student insisted. .

Another male classmate said seriously: "But after that case, the administrator became ill, and he passed away within two years. How could there be subsequent crimes?"

"You are the one who is limited by fixed thinking." The female student said, "He can be a copycat of the series of crimes. This case can be a copycat. The purpose is to disturb the police's sight and make the police mistakenly think it is a spider. The killer did it, so that he can clear the suspicion, and in fact he did succeed in the end!"

"Back then, the newspapers only published where and who was murdered, and did not disclose the details of the crime. Except for the police insiders, who would know the details of the crime?"

There was a lot of debate in the classroom, and the professor patted the desk and said: "Okay, the issues you discussed have been discussed by every student in the past. I can't imagine that after so many years, the voice in the classroom is still the same. The person who handled this case There are many old detectives, which one is not more experienced than you, and which one is not more experienced than you? If you are all right, then the murderer will not be found until now."

He then asked the female classmate who still didn't want to sit down: "Since you think what you said is reasonable, let me ask you again, the industrial pollutants that were poured on the corpses were waste water discharged privately by the steel factory, waste water and public toilets. The excrement was discharged together in the same ditch, and after the crime, the murderer went around to the ditch behind the public toilet to get industrial wastewater, and then poured it on the corpse in the public toilet. Tell me, why did the murderer do this?"

The female classmate said: "In order to destroy the evidence. Industrial pollutants will affect the validity of DNA."

"Since you said the murderer was the administrator, how could a public toilet administrator in those days have the knowledge that industrial pollutants would destroy the validity of DNA?"

"He might be..." The female student couldn't answer the professor's rhetorical question, and hesitated for a while, "Then maybe he's a psychopath and just wants to humiliate the corpse?"

"Okay, what you said is also reasonable." The professor said, "but you missed important information. The public toilet manager died in 99. After his death, the police extracted the damaged DNA in that case, and 04 The DNA left by the criminal in the case in 99 matches. How can a person who died in 04 commit another crime in [-]? How do you explain this?"

"This... this..." The female student was speechless.

The professor asked her to sit down, glanced around among the students in the seat, and fixed on the person beside him who was buried in taking notes: "Yin Shun, tell me."

Yin Shun, who was drawing a Q-version villain resembling Xia Huai, heard the professor call his name, stopped writing, and stood up calmly: "The murderer must not be the administrator. Let alone the administrator died in 99, according to the According to the information provided by the police, the administrator has suffered from polio for many years, and the strength of his two hands is absolutely unable to cut off the limbs of the deceased so neatly, let alone re-pin them on the deceased's body, and let the nails pass through the deceased's bones .”

The professor gave a "hmm" and said, "Then tell me, who is the murderer?"

Yin Shun speculatively said: "The murderer should have been a factory worker at the time. At that time, the island was in the period of industrial development, and there were factories everywhere. There was a trade fair in Shanghai in September 1997, and there were four factories on the island that year. are eligible to participate.

"Two months before the fair, all the workers in the four factories had to stay up late to make products for the exhibition. In addition to the steel factory owned by the deceased's father, these four factories also had a furniture factory, a cotton factory, and a hardware factory. Among them, the distance between the furniture factory and the steel factory is less than one kilometer. At that time, ten suspects were found in the steel factory, and three suspects were found in the furniture factory. In the end, all thirteen people were released due to insufficient evidence.”

The professor said to the students: "Look, before making inferences about an unsolved case, you must fully understand the background of the time when the case occurred. If the materials are fully prepared, you will not make simple mistakes."

The female classmate Xinzhi said "making simple mistakes" refers to her, and she lowered her head in shame.

The professor gestured to Yin Shun: "Go ahead."

Yin Shun continued: "The murderer is not among the thirteen suspects found by the police. The murderer should be a privately hired casual worker. This kind of cheap casual worker was very common in those days, and five cents could help people Work for an hour. For example, worker A works in a furniture factory. Before the exhibition, the factory manager would not allow any worker to take leave. Worker A had a stomachache or other reasons that night, so he had to privately hire a murderer to replace him. Wear Wearing work clothes and work caps, the workers at the edge of the assembly line look the same, and no one notices that worker A is missing. It is even possible that no one remembers the appearance of worker A at all.

"From [-]:[-] to [-]:[-] in the morning, the workers in the furniture factory changed shifts, and the off-duty workers went home on the main road. Fearing that they would be discovered as privately hired casual workers, the murderer chose to take the mountain road behind the furniture factory, and walked along the road before leaving. The hammer and saw blade from the furniture factory were stolen. According to police information, the furniture factory lost a hammer and a saw blade on the day of the crime.

"Walking back on the mountain road is the scene of the crime. When the murderer was walking alone on the mountain road, he already had the idea of ​​committing the crime. He brought the crime tools from the furniture factory, and the thick iron nails used to assemble the corpse came from two factories. Just at this time, he saw Hua who was going to the public toilet, and then started to commit crimes. Later, when the incident happened, worker A who privately hired the murderer was not included in the scope of suspects by the police. He was afraid that he would be involved in this case, and even more afraid The factory manager learned that he would be blamed if he privately hired casual laborers, so he didn't tell the matter, and planned to let it go, so the police missed this important clue."

"The murderer is such an unfamiliar face, just working in the factory like this, and after work, he went to the road behind the mountain privately, and no one in the factory noticed anything unusual?" the professor asked.

Yin Shun said: "At one or two o'clock in the middle of the night, the workers are working hard. Even if someone finds an abnormality, who can be sure that it is not due to fatigue and misjudgment? In that era, workers with little knowledge, in order to keep their hands With a bowl of rice, you can be alone, and you will never go into muddy water easily. Therefore, it is not that no one has discovered the anomaly, but that those who have discovered the anomaly have chosen to remain silent."