"The first case was on March 15, 2008," Gu said slowly, "the victim's name is Zhou Peng, a former class teacher at the Law School of Xikai University of Political Science and Law, and the cause of death is ...... After the rainstorm, the road was slippery, the vehicle lost control, and a stone flew away, and after the stone bounced off the wall at a very high speed, it flew into the cab and cut the major artery in Zhou Peng's neck, and on the way to the hospital, he died of excessive blood loss. ”

"The road is slippery, a certain probability event. Vehicle out of control, small probability event. Flying stones, a small probability event. There is just a wall, a small probability event. The flying stone can also cut the major artery in the driver's neck, and it is a small probability event in a small probability event, on the whole, the possibility of such a thing happening is-" Pan Lei frowned and thought for a while, and said, "One in ten million." ”

"No, a 1 in 30 million probability." The eldest lady added.

"You can make a bold guess about how this murder was caused." Director Gu said.

"If this incident is not a coincidence, then someone must have deliberately designed it, and it was a high-IQ crime. Probably, the vehicle was tampered with, and the stones were carefully calculated and placed in just the right place. But I don't know how the vehicle just lost control and just crushed the rock. Pan Lei said truthfully.

"He is worthy of being a criminal investigation expert, and he immediately said the key to the case. However, we checked for a long time and came to the conclusion that the car was out of control due to disrepair. The stone was exposed because of the heavy rain that washed away the road, and after it was exposed, it was accidentally kicked to the right place by a classmate walking with an umbrella. At that time, we could only characterize this case as an accidental casualty. ”

"I know the answer. But wait until the end. The eldest lady said lightly.

Director Gu glanced at the eldest lady and did not speak.

"And then? There was a second case? Pan Lei said.

"Yes. The second incident occurred on April 15 of that year, and the deceased was Jiang Yan, dean of the Law School of Xikai University of Political Science and Law. The cause of death was that while walking with his wife by the river, his wife was continuously bitten by a mosquito. When his wife shot the mosquito to death, her center of gravity was unstable and knocked down Jiang Yan, Jiang Yan had cramps in her hands and feet, rolled down into the river, and was entangled in aquatic plants. His wife couldn't swim, she shouted loudly, and when the people came, Jiang Yan had already drowned. Again, it was a coincidental death, and we did not detect any traces of man-made. ”

"The third, which occurred on May 15, was the victim of the school principal in the first two cases. In his home, the gas pipe was faulty and leaking, the electrical circuit in the home was aging and falling off, and when he returned home, a fire suddenly broke out, killing him in the fire. ”

When Director Gu paused, Pan Lei took the opportunity to ask: "The same school, on the 15th of every month, from the head teacher to the dean, to the principal, there are coincidences everywhere...... It's really all in one catch, what a lot of hatred it should be. If there is really a murderer, it is very likely that it is a student at this University of Political Science and Law, and a student in the class of the first deceased. ”

"Yes...... The killer certainly exists, because the common denominator in each case is all too obvious. Naturally, we went to investigate, but not a single student in the entire school was in or out of the crime scene. So we still can't determine whether the mysterious murderer is the student who took the school. ”

"You all guessed it, it's a student at Xikai University of Political Science and Law. But I can't tell you directly. The eldest lady spoke.

"Why?" Director Gu asked curiously.

"Because once I say it, the murderer may not be him. Leave me alone, you go ahead. The eldest lady said again.

"Did the three deceased have a common enemy? Or people who are entangled in interests? Pan Lei asked.

"No, we found that the only connection between them is the staff of the same school. In private, there is very little contact. ”

"The fourth deceased, is it also from this school? Is the date of death June 15? Pan Lei asked again.

"The deceased is not from that school, but Zhao Lei, the former director of the North District Education Bureau where Xikai University of Political Science and Law is located. The time of death was indeed June 15. The cause of his death, also coincidence, was a complete record of the incident. At that time, Zhao Lei was inspecting a newly built primary school. A master is painting the walls on a tall wooden frame. Investigating later, he drank a little alcohol and kept shaking the planks back and forth to paint the walls, causing the paint bucket he forgot to fix to shift and gradually slide towards the edge. By the time he could react, the paint bucket had fallen downward. He hurriedly reached out to pick it up, but his center of gravity was unstable and he fell to the side. When he struggled, the safety rope suddenly loosened, causing him to fall from a high altitude, which happened to hit the body of Zhao Lei, who was inspecting. Zhao Lei died on the spot, and the painter was only slightly injured......"

"The fifth, who is also a former leader of the North District, is named Gao Shen, a former representative of the North District People's Congress. He died on July 15, a relatively simple process in which he was mediating between two local communities. The cause is the ownership of the newly built park square in 2007 between the two communities. This square was originally used by two communities, but it has been occupied by one community for a long time. The other community has long been unpleasant, so it often causes trouble, and small conflicts are frequent. In the end, the two sides agreed to mediate on July 15, 08, with their elected senior representatives. However, during the mediation process, the representative of the community that occupied the square spoke disrespectfully, and the representative of the other community could not look past it and scolded a few words back. Then, scolding and scolding, it escalated into a martial fight. During the fight, a person from another community who was vulnerable suddenly picked up the fruit knife on the table, rushed to the opposite side and stabbed a few times, one of which just stabbed straight into the heart of Gao Shen......"

"The sixth deceased, who died on August 15, was Dong Hao, director of the North District Public Security Bureau. At that time, because of the frequent murders and the lack of police force, he was in the second line, and he could only return to the battlefield. Before his death, he was driving after a fugitive. There was only one fugitive with a homemade pistol in his hand. As he was about to catch up, he fired two shots indiscriminately in the rear. From the perspective of ballistic analysis and trace analysis, the fugitive's first shot hit the front tire of Dong Hao's vehicle, causing his vehicle to lose control, and causing him to crash head-on into the bullet that was originally out of direction......"

After saying a long word, Director Gu picked up the water cup and took a few sips of tea.

"These three cases, all of which were also on the 15th, were also coincidences, and the people who died were also leaders of the North District...... What's the connection? Do they all have corruption problems? Pan Lei asked tentatively.

Director Gu shook his head.

"If this matter is revealed, it will definitely cause political turmoil!" Pan Lei said in a deep voice.

"Unfortunately! It was indeed leaked by a reporter. What a nightmare it was! The condemnation of public opinion, the constant pressure exerted by leaders, large and small. Many comrades stayed up all night again and again, tired of investigation, but at a loss, and then fell tired to their posts one by one. There are also three comrades who had a car accident because of long-term fatigue driving...... Died in the line of duty...... What's worse is that imitation cases continue to appear, and criminal gangs have also emerged, making the already scarce police resources even worse. We applied for support, and the police officers from nearby provinces joined the search, investigation, and crackdown on criminal gangs without complaint. We even pulled out the outstanding students of the police academy in their fourth year to do the investigation work...... But it also made more police officers sacrifice on the front line...... Now that I think about it, it was the darkest time in the city's history. When Director Gu finished speaking, his eyes couldn't help but turn red.