After discovering the body of the deceased, Bao Chen and they conducted a visit and investigation near Mingxi Road, and soon found out the identity of the deceased, and the parents of the deceased had just returned from the police station to report the case, and they heard that a girl was found killed in the public toilet on Mingxi Road, and when the couple saw the tragic death of their daughter, Yu Xinying's mother passed out on the spot.

When Bao Chen took the deceased's parents to the public security bureau for questioning, Yu Xinying's mother Liu Lan woke up, Liu Lan kept crying and kept telling the police that her daughter was a good child, although she was not very good at studying, but she was usually very obedient, but Yu Xinying's father Yu Jing had been silent, and there seemed to be something unspeakable.

After some enlightenment and persuasion, Yu Jing said some things about her daughter Yu Xinying.

Don't look at Yu Xinying is only sixteen years old, but she talked about three boyfriends, except for the first one who is her classmate, the remaining two are gangsters in society, bad young people, because of this incident, Yu Jing was found by Yu Xinying's teacher to find the school, Yu Jing every time he went back from school, he criticized and educated Xinying, but the child was older, and he happened to be in the rebellious period, and he couldn't listen to his parents' teachings at all, but fortunately, although Yu Xinying was rebellious, Yu Xinying never didn't go home at night, Although I go back late every night, I will go back.

After Bao Chen knew the identity of the deceased, he went to Yu Xinying's school to visit and investigate, especially when Yu Jing's parents mentioned the two boyfriends, after some investigation, it was found that the gangsters who had been mixed with Yu Xinying for a long time happened to be locked up in the detention center for theft not long ago, and they had not been released.

When visiting Xinying's classmates and teachers, according to Yu Xinying's classmates, Yu Xinying is a very beautiful girl, she wears flowers and branches at school every day, she doesn't look like a student at all, and often mixes with undesirable young people in society, if it's just like this, Yu Xinying's private life is also very chaotic, and at the same time she is very close to several male classmates, they often see Yu Xinying hugging different boys in the school's playground or grove, and she has been discovered by the teacher. Therefore, Yu Xinying's parents were also called to the school.

In addition, Yu Xinying has loved to make small reports since she was a child, and often says bad things about other girls behind her back, when she was just a freshman, Yu Xinying lived on campus, but after half a semester, no one wants to live with her anymore, because Yu Xinying often tells others about some of her roommates' physical characteristics, especially the characteristics of privacy and parts, girls at this age, they all begin to develop, and they will naturally start to wear underwear, Yu Xinying often tells her roommate what underwear she wears today, what style, what color, Even what size to tell others, if it is only a girl, at most it will be complained a few words, the key is that Yu Xinying not only told the girl, but also told a lot of boys in the same class, which made these girls unable to raise their heads in the class, because of this matter, the teacher looked for too Xinying more than once, but it was useless, Yu Xinying still went her own way.

In the eyes of her classmates, Yu Xinying is a girl with a chaotic private life, likes stinky beauty, and loves gossip, and in the eyes of the teacher, Yu Xinying is a precocious and very rebellious child, who needs the correct guidance of teachers and parents.

According to the feedback of teachers and classmates, the police found a few boys who were particularly close to Yu Xinying, and after some questioning, they admitted that they were indeed very close to Yu Xinying, and often hugged and hugged together, but did not have sex, and later found through an autopsy that although Yu Xinying's private life was chaotic, she was still a virgin, and she saw that although Yu Xinying was rebellious, she still knew self-love.

As for Yu Xinying's parents, Yu Xinying said on the night of her death that she went to her classmates to review her homework, according to the investigation, there was no such thing, she should have lied to her parents and went out to play, as for who Yu Xinying saw before she died, and who attacked and killed her, I don't know for the time being.

The next three deceased people have not yet been identified, and this will require a lot of investigation.

After listening to these reports, Xu Lang found the following characteristics.

First, the places where the five deceased died were all in the public women's toilet, and although the places of death were not in the same neighborhood, they were all found in the public toilets.

Second, at the scene of the crime, the murderer left the three English letters 'S.U.E', as for the meaning of these three letters, it is not known for the time being.

Third, the five deceased have a butterfly-type tattoo on their ankles, which can be used as a clue to solve the case, but it is of little significance.

Fourth, five deceased, four women and one man, ranging in age from thirty-four to sixteen years old, both underage girls, divorced young women, and adult men, after they were killed, they all had their tongues cut out, although now only the identities of the two deceased have been clarified, according to the investigation, it was found that the two deceased had a characteristic before their deaths, that is, gossip, like to tell right and wrong.

Fifth, the composition of high-concentration ethanol was found in the bodies of the five deceased, and after autopsy, the deceased did not drink alcohol before death, indicating that the murderer could get high-purity ethanol, and high-concentration ethanol is generally a hospital supply, and ordinary people can rarely get it, indicating that the murderer is likely to work in the hospital.

According to the above characteristics, Xu Lang summarized the next detection direction.

First, it is necessary to investigate the identities of the remaining three deceased, mainly to investigate recent reports of disappearances, and to investigate the missing persons.

Second, find a way to figure out what the 'S.U.E' symbol that the killer left at the scene means.

Third, according to the butterfly tattoo on the ankle of the deceased, a visit to the large and small tattoo shops in S City was conducted to find the tattoo shops of the deceased.

Fourth, visit hospitals, clinics, and factories that use high-purity ethanol.

Fifth, check the surveillance footage near the scene of the crime on the night of the incident.

Sixth, investigate whether Pi Ruyu and Yu Xinying have interpersonal communication, since they have refined gossip and told right and wrong before their deaths, then check to see if there is anyone who knows each other, if there is, then this person is very suspicious.

After Xu Lang said this, Wu Yong frowned and asked, "There are so many directions to investigate, we only have so many manpower, isn't it..."

Before Wu Yong finished speaking, Xu Lang said: "We don't have time, Director Lu only gave us ten days, if the case can't be solved within ten days, you still think about how to explain it to him." ”

Wu Yong was speechless by Xu Lang's speech, and stood up directly and began to assign tasks.

Wu Yong and Ning Yanran seemed to have a tacit understanding in advance, the first criminal investigation team continued to investigate the identity information of the deceased and visited the residents near the crime scene, as well as continued to visit and investigate the interpersonal relationship between Pi Ruyu and Yu Xinying, while the second criminal investigation team visited and investigated the tattoo parlor and major hospitals, clinics and factories, and the matter of viewing the surveillance video, the two teams did it together, as for the problem of the symbol, it was solved by Xu Lang, Wu Yong and Ning Yanran.

After the meeting, everyone began to take action, although the people of the first criminal investigation team were very uncomfortable with the involvement of the second criminal investigation team in this case, but when they heard that there was only ten days to solve the case, everyone felt the urgency of time, and they all began to act without complaining.

After the first and second criminal investigation teams left, the conference room was empty all of a sudden, leaving only Xu Lang and Ye Xuefei.

After Xu Lang analyzed the direction of the detection, he lowered his head and looked at those files, not noticing Ye Xuefei.

Ye Xuefei saw that Xu Lang was pondering, so she didn't bother Xu Lang, walked to the underground morgue alone, and continued to start the autopsy.

When Xu Lang was looking at the file, he found a strange thing, that is, the first case occurred on June 10, the second case occurred on June 15, the third case occurred on June 23, and the fourth case occurred on June 28, with a gap of five days between the first and second cases, and a gap of five days between the third and fourth cases, and an interval of eight days between the second case and the third case, and an interval of eight days between the fourth case and the fifth case. So what is the murderer doing in the interval of five and eight days, is this a pattern, if this is a law of the murderer killing people, then will the next case happen five days later, that is, on July 11th? If this is the case, then there are only five days left before the murderer commits the crime again, no, it should be four days, which makes Xu Lang feel a huge pressure.

Xu Lang looked at the locations of the five cases, Caihua Road, Mingxi Road, Fangxi Road, Changyang Road, Baima Road, Xu Lang looked at it, while finding a map of S City, and marked these places on the map, after the marking was completed, Xu Lang found that the five locations were gathered together, and there were four places that could be connected into a cross, Caihua Road, Mingxi Road, Fangxi Road, Changyang Road, these four places can be connected together, they are located in the four directions of east, west, north and south, and the scene of the fifth case, Baima Road, Located in the middle of Caihua Road and Mingxi Road, if the two roads of Caihua Road and Mingxi Road are regarded as a triangle with a 90-degree angle, then Baima Road is the line that divides this triangle into two.

So, Xu Lang wrote and drew on the map, and soon, a rice-shaped map appeared on the map, and at the intersection of this rice-shaped, it happened to be the TV station of S City.

When this result appeared, Xu Lang was very puzzled, if you look at it according to this map, then the murderer's next crime location is likely to be the area of Fenghua Road.

After getting this result, Xu Lang immediately called Wu Yong and Ning Yanran, and asked them to focus on investigating the area of Fenghua Road next, although everyone was puzzled, they still did it.

After the case analysis meeting ended, it was more than two o'clock in the afternoon, and it was already past the meal, Xu Lang's stomach made a protest sound, so Xu Lang stood up and left the conference room.

As soon as Xu Lang walked out of the conference room, the mobile phone in the bag rang, Xu Lang took out the mobile phone and looked at it, with a helpless wry smile on his face, it was no one else who called, it was the female DJ Allen of the COCO bar.

After the phone was connected, Xu Lang asked, "What's the matter with me?" ”

"Can't I look for you if it's okay?" Alan asked in a very aggrieved voice on the other end of the phone.

Xu Lang's face was speechless, and he said helplessly: "Yes, but, I'm very busy now." ”

"I know you're busy, and I know you haven't had lunch." Alan said with a smile.

"How do you know?" Xu Lang asked puzzled.

"Because I'm at the door of the police station, you come out quickly, I brought you something delicious."

"Not good." Xu Lang touched his nose and said.

"Hurry up."

After speaking, Alan hung up the phone, Xu Lang put down the phone, shook his head, and had to walk out of the police station to get the so-called delicious food.