After reading the review of the case, Yu Bule asked Inspector Qin to bring the investigation team to the three scenes of the four cases without attracting attention as much as possible, and Sun Yanyan explained again at the scene, the status of the deceased at each scene, the location of the evidence and the reason for the evidence collection, the girl showed a strong memory, and she did not need to look through any information, and she could review the scene of more than a year at most.

Each site inspection lasted more than two hours, and everyone stayed hungry until the evening, when they went to the red light district before the lights were turned on and found a restaurant to eat indiscriminately. Then thanked Inspector Qin for his help and took Sun Yanyan back to the hotel.

At five o'clock, in Yu Bule's room, a case analysis meeting was organized.

"Let's talk about your opinions, Sun Yanyan don't speak first, let's start with Yu Lei, and the discussion will last for three hours. Lin Zhenna finally summed up. Yu Bule said.

Everyone was gossiping, analyzing and supplementing, everyone expressed their opinions, and finally Lin Zhenna summarized the analysis opinions of five people. Unexpectedly, in addition to Lin Zhenna, who had studied detective classes with Yu Bule, the team discussion had the best performance in the discussion and speech Jin Yuanyuan and Zhang Pingbo, one of them graduated from the Knight School with a major in intelligence analysis, and the other graduated from the Department of Economics of Civil Affairs University, but one has a clear mind and is good at connecting intelligence clues, and the other pays attention to data and is logical. The performance is better than Tan Jia, who studied law, and Yu Lei, who used to be an anti-smuggler.

First of all, from the analysis of the target of the crime, the other party should have discrimination or even hatred against prostitutes for specific groups of people and professional crimes. The age span of the deceased is large, from 19 to 32, and the appearance and clothing are quite different, indicating that the murderer did not have a special choice, and the murderer was judged to be over 35 years old; All four of the deceased had signs of sexual behavior before their deaths, but no semen residue was found, and the killer had no possibility of semen; Judging from the posture of the deceased, it is suspected that the murderer suddenly broke his neck bone with his left hand during sexual intercourse behind his back, so it is judged that the murderer is tall and has at least military captain-level force, and is suspected to be an active or retired officer; The latter two deceased appeared to have stockings tied to their hands, indicating that the murderer had abusive tendencies; The perpetrators all committed the crime with the left hand, and the murderer was judged to be left-handed or left-handed; Some witnesses found that the second and third deceased had left the red light district alone, suspected that they had walked to the scene of the crime on their own or joined the murderer in a hidden place, so they should know the murderer; At the time of the latter two deceased's crimes, the murder of prostitutes in Yecheng had already caused social panic, and the practitioners were in danger, but the murderer was still able to commit the murder, and even brought the last victim to the scene of the first case, indicating that the murderer had a certain social status and a social status that could deceive the victim to reassure him or threaten the victim to obey; The scene is very clean, avoiding the attention of all witnesses, and should be very familiar with the vicinity of the red light district in Beicheng District, and thoughtful, with anti-detection capabilities; The interval between the murders is gradually lengthened, which does not conform to the rules of ordinary serial homicide cases, indicating that the murderer has strong self-control ability and pays great attention to safety; The murderer has shown abusive tendencies, and although it is not serious, it can be inferred that the murderer will inevitably commit another crime.

"Not bad. It's nice to come to such a conclusion in one day. Yu Bule listened to Lin Zhenna's summary opinions, nodded and praised slightly. Sun Yanyan, do you have anything to add? ”

"Ladies and gentlemen, the content of the analysis in such a short period of time is more detailed than the analysis of the Metropolitan Police Headquarters for half a month." Sun Yanyan's eyes flashed with little stars, the corners of her mouth were crooked, and she smiled very sweetly.

"It's not for you to add your opinions." Yu Bule waved his hand.

"I doubt it...... Can anything be said? Sun Yanyan paused, and after receiving Yu Bule's affirmative eye encouragement, she continued, "I suspect that the murderer is not only an active-duty soldier, but also an active-duty officer of the City Guard. ”

"Oh? So continue the investigation? Yu Bule raised his eyebrows.

"No, we can't check the affairs of the army. And the people from the Capital Police Department reacted, and there was no follow-up. Sun Yanyan lowered her head. In the capital of Yecheng, there are 10,000 city guards and more than 170 officers. I wanted to report to the Military Inspection Department, but the director and inspector didn't let me go because there was no evidence. ”

"It's already good, is there anything else?" Yu Bule saw that Sun Yanyan seemed to want to speak and stopped, and continued to ask.

"And ...... I have always suspected that the second scene number 11 evidence point, the third scene number 15 evidence point is that the knife was used to let go of the grass lodging and dirt dents caused there, so that the murderer was equipped with a knife in his left hand, not left-handed, and it is possible that his right hand was injured, so he used to kill with his left hand. ”

Yu Bule nodded with satisfaction. The other team members also gave Sun Yanyan a look of appreciation.

"Zhenna, let Sun Yanyan take you to the Yecheng Gendarmerie and find their captain to reveal his identity. The murderer is a company commander level, has been injured in the right arm or right wrist, has a slight disability in the left foot, and other conditions are consistent with your judgment, married and childless. Let them be arrested and interrogated directly. ”

Seeing Lin Zhenna, they were all a little blind.

Yu Bule explained: "You take a closer look at the evidence photos 5 and 10 of the No. 3 scene. The murderer used his right hand and left hand to pull out the reeds, his right hand was not as strong as that of ordinary normal men, and there were traces of twisting and breaking in the broken wound, and the left hand was pulled out very neatly, and it was swept away. As for the feet, carefully analyzing the traces at scene No. 3, you can find that when the murderer used his foot to smooth out the footprints, he used his left foot more often, relying on his right foot to stand, and when he left, the traces at the embankment steps were analyzed, and the left foot should be crossed two steps at a time, and the right foot should be crossed one step at a time, which can testify that his left foot cannot bear the force. ”

In addition, Tan Jiaren sent a telegram to the bureau and asked the Operations Department to send someone to hand over the prisoners. Regardless of whether there is direct evidence or not, I let the people of the Operations Division give a confession, and the gendarmes will interrogate the Operations Division if they do not move. It doesn't matter what method they use. What's more, although the murderer is cautious, his will is not firm, and he may be recruited directly. The big deal is that Sun Yanyan will find two fake witnesses and see him leave a nearby street in the early morning of December 24, and he will collapse. Nearby youths are on the line. Seeing the resistance in Tan Jiaren's eyes, Yu Bule added.

The officials of the Investigation Bureau all have military positions, and the Military Police Department does not dare to slack off, and the characteristics of the target have been accurately locked, and Duan Mou, the commander of the city guard company, was secretly arrested that night.

Duan gave up his resistance and confessed to the crime after hearing the gendarmes say that Sun Yanyan had evidence that he had been witnessed at the scene on the night of the second case on December 24 and were looking for the rest of the witnesses at the scene.

The next morning, Duan's confession was delivered to Yu Bule.

Duan, 38 years old, originally belonged to the cavalry division of the Northern Army, joined the army at the age of 19 and was promoted to non-commissioned officer at the age of 25 because of merit. Originally, although the injury was quite smooth, but after coming to Yecheng, after many years of marriage, he found that he was born without semen, and he has been unable to have children, and because of the injury, he could not continue to be promoted, and he became more and more irritable and began to seek comfort in the red light district.

Tall and handsome, he established a secret relationship with the first victim, Zhang, and the two people with a rough fate comforted each other, and Zhang also gave him a lot of comfort as an older sister. However, on the night of October 10 last year, he had an unhappy relationship with the chief during the day over the promotion issue, and he had a quarrel with his wife, and when he needed comfort the most, he suddenly heard that the Zhang family was about to leave Yecheng to settle in the surrounding counties. Feeling abandoned by the whole world, he went completely crazy, so he killed Zhang on the spot.

Since then, he has found the thrill of murder, so he quickly has a second case. Only this time, for the purpose of killing, he asked the victim to meet by passing the note in the evening and then taking it back, and ordered the victim to keep it secret. As the patrol chief of the Northern District, he was like a heaven-like existence for the Liuying, and the Hu clan was easily killed by him without preparation.

When he left the scene, he really met several drunken young people who violated the curfew, and in order not to arouse suspicion, he also gave them a strict evaluation and education, and raised his noble hand to let the young people leave without punishment. This also explains why the police could not find a clue later, and he quickly gave up his resistance after hearing that there were witnesses to the crime who saw him at the scene of the crime.

Because the previous case has been reported in the newspaper and spread by the public, it has caused social panic, and in the third case, Duan changed the location of the crime, and deliberately pretended to have a sadistic hobby, and asked to tie Wang's hands with stockings to dispel the victim's vigilance. However, because the location of the crime was chosen by the Wang family, it was inevitable that the muddy grass and river beach would leave clues, so he planned to stop the case after that.

After nearly five months, the victim of the last case, Wang, appeared. Young and beautiful, because she first came to Yecheng to make a living, she wanted to get Duan's protection, and because she was not vigilant when she first arrived, she took the initiative to lure Duan, and even proposed to imitate the serial murder case and play with stockings to tie up wild, which is also the latest popular prostitution method in Yecheng's sex circle. Unexpectedly, it awakened the real demon.

Duan, who had already decided to stop completely, didn't expect that the information in the third case had been fully exposed to him, but the fourth case had accelerated to attract the powerful hunter of the Prosecutor's Office. It was easy to lock him down with on-the-spot analysis alone.

However, Yu Bule scoffed at this, the evil wolf with blood will definitely not be vegetarian again, and he will continue to commit crimes sooner or later. Except for the first case, which was a temporary intention, the last three were all premeditated murders by Duan, and each time they were suddenly started in the course of the intercourse, and Duan had already gained great pleasure in the process of such a murder, and it was absolutely impossible to stop. Once he breaks through the psychological defense, he will continue to commit crimes with a high frequency.

Even if there is no prosecution office, Sun Yanyan will find him sooner or later. The little girl blushed happily, and repeatedly said that if there was no commander, she would not have the right to investigate the active soldiers, and she might not be able to catch Duan in a few years, and with Duan's cautious and escalating methods, I don't know how many people will be killed, even if it is not just a prostitute. If there is a imitation effect, the consequences are unimaginable.

The Yecheng serial murder case was solved by the prosecutor's office on the spot in one day. It's off to a good start.