Early the next morning, in the office of the criminal police team of the Jing'an City Public Security Bureau, the whiteboard in the conference room pasted relevant information about the case, and the clues of the case were written with different colored pens.

All six field investigation teams arrived, and together they worked out the direction of the next investigation of the case.

Lu Ke stood up, pointed to the whiteboard behind him and said:

"First, the crime scene was in the woods of the school, and the fact that such a location could be found and selected shows that the murderer was a person who was particularly familiar with the campus environment.

Second, the time of the crime was at night, which completely avoided the work time of the construction team, indicating that the murderer knew the construction time in the school very well.

Third, according to the clues we investigated, there was a thief in the school who specialized in entering the girls' dormitory to steal socks, and the deceased in this case also had a considerable degree of foot fetish complex, and the two cases were most likely the same criminal.

So now, listen, we are looking for a man who is engaged in logistics maintenance, no more than 30 years old, unmarried, and living alone. He was able to come and go freely on campus and was able to take advantage of his work to get in and out of the girls' dormitory. We started with the school staff and the greening team, and gradually expanded the scope to include male students who stayed in the school. ”

The detective teams replied solemnly: "Yes! ”

The office was empty, and only Lu Ke, Ling Zizhen and Mo Yufei remained.

After being silent for a long time, Mo Yufei suddenly asked Lu Ke: "What if the murderer escapes?" ”

Lu Ke smiled faintly and said in a deep voice: "In this critical period, whoever escapes is the murderer. ”

After speaking, he turned his head to look at Ling Zizhen and asked him, "Can the tooth membrane be compared on a large scale?" ”

Ling Zizhen shook his head and said with some embarrassment: "The tooth membrane is not like a DNA picture, and the similarity between the sample is very great, and it can only be used for accurate comparison in a small area. Moreover, the target dental membrane has no characteristics, and there is no way to do a large-scale comparison. ”

Lu Ke took a deep breath and didn't say anything more.

After a while, Su Simeng walked into the office quickly and said, "Team Lu, I have already contacted the school's logistics director, we can go over now." ”

The police car drove into the campus, and at the door of a building in the northwest corner of the school, Lu Ke met a woman. She looks like she is in her thirties, neat and tidy in casual clothes, and looks very capable.

"Hello, I'm Lu Yanyan, the logistics director, and I rushed over immediately after receiving the call, didn't delay your case?"

The woman stepped forward and held out her hand to Lu Ke.

Lu Ke also stepped forward and shook her hand: "Thank you so much for bothering you to come to school during the summer vacation." ”

"Where, it is appropriate to cooperate with the police to handle the case, let's go in and talk about it." Lu Yanyan showed a very standard smile, and this smile couldn't help but remind Lu Ke of Tang Mengxue.

Stepping up the steps, the door chained. Lu Yanyan took out the key from her pocket and said while opening the door: "The whole building is a logistics department, it's summer vacation, and no one goes to work, so the door has been locked." ”

As she spoke, she habitually fastened the lock, hung the entire chain on the doorknob on one side, and then opened the door and walked in.

Lu Ke followed her and walked through the door.

The building is very secluded, with warehouses on the left and right sides of the building, where various items are stored.

Lu Yanyan slowed down and glanced back at Lu Ke every few steps. Then, she walked up the stairs, not forgetting to introduce the situation of the logistics department to Lu Ke.

"Our logistics department is responsible for the distribution of miscellaneous materials, from computers and projectors for teaching, to chalk and blackboard erasers. If there is a damage to the equipment in the school that needs to be repaired, we have to do it. ”

Lu Ke nodded, followed her all the way, and came to the office on the third floor.

The office door was still locked, and she reached for the frame, where she pulled out a key and unlocked it.

"I heard on the phone, you want to take a look at the repair record, right?"

Lu Yanyan was the first to enter the house, found the main power switch on the wall, and turned on the computer.

Lu Ke nodded and said seriously: "Yes, we have to investigate all the repair records of the girls' dormitory in the past half a year. ”

Lu Yanyan smiled: "No problem, every maintenance work we have has a detailed record." ”

With that, she operated the computer and called up a list of records. Then he stood up and gave up his place to Lu Ke.

Mo Yufei habitually handed over a USB flash drive, and before she could speak, Lu Yanyan preemptively said: "You read it first, and I'll give you a copy after reading it." ”

The repair record is very detailed, with detailed time, dormitory, dormitory number, and corresponding maintenance personnel.

In the past six months, the girls' dormitories have been repaired 16 times, covering six girls' dormitories. Eight of them were air conditioner leaks, three were sewer backwater, and the rest were basically electrical problems.

Su Simeng stood beside Lu Ke, also looking at the computer screen, and he whispered: "Judging from the records, these sixteen repairs are all small-scale, and they are all based on the dormitory. ”

Lu Ke thought for a while, and also said: "But Qi Lingqiu said that they lost things in multiple dormitories at the same time, and they involved multiple dormitories. ”

Su Simeng stood up straight, feeling a little puzzled for a while: "Didn't you follow the maintenance personnel in?" ”

"And how did he get into the dormitory?" Lu Ke pondered for a moment, looked at Lu Yanyan, and asked her, "In addition to the students' repairs, do you regularly inspect the equipment in the dormitory?" ”

Lu Yanyan didn't think about it, and immediately replied: "The equipment is repaired after the students find the damage, but we will regularly check the circuits in the dormitory building." After all, each of our dormitories has its own air conditioner and water heater, and circuit safety is very important. ”

Hearing this, Lu Ke stood up and hurriedly asked, "How often do you conduct circuit checks?" ”

Lu Yanyan said seriously: "It is carried out about once every two months. ”

"What about time?" Lu Ke asked.

Lu Yanyan said lightly: "I don't know much about the specifics, we are looking for a professional electrician to conduct the inspection, and the time should be in the morning." Because we need to pull the brakes for maintenance, we usually choose to do so in the morning when the students are not there. As a result, by the time the students finished class at noon, we were basically all overhauled. ”

Hearing this, Su Simeng's whole person was as if he had been beaten with chicken blood, he was very excited, and his voice was raised a little: "The electrician entered the dormitory to repair the circuit, did the school staff follow?" ”

Lu Yanyan nodded: "After all, these electricians are hired by us from outside the school, and they are not internal personnel of the school, so there should be security guards to follow." If a student loses something, we can't afford to do that. ”

Lu Ke pondered for a moment and asked her, "Do you have the contact information of an electrician?" ”

Lu Yanyan was stunned for a moment, and asked with some puzzlement: "Electrician?" Which electrician? We have multiple electricians working at the same time, which dormitory are you looking for? ”

Lu Ke froze and said seriously: "Girls' dormitory." ”