Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Zhang Mengyao's body was found in the Experimental Primary School, where he worked.

Regardless of why the murderer did this, the fact that he was able to put the sculpture inside the Experimental Primary School shows that he must be familiar with the Experimental Primary School.

Judging from this clue, it is very likely that the other party works in an experimental primary school.

So when Zhang Mengyao left school a long time ago, who else left with her?
Based on the investigation at Zhang Mengyao's residence, there was no possibility that she returned home alone.

Either they didn't go home, or they went home but drove to the underground parking garage.

Because there are surveillance cameras at the entrance to the community, if Zhang Mengyao went home alone, she would have gone home from the entrance of the community as usual, so the surveillance cameras would have captured her. This should have been discovered during the investigation of Zhang Mengyao's disappearance.

So he either didn't go home, or if he did, he should have taken a bus back through the basement.

Based on the on-site investigation, Lu Chuan is more inclined to believe the second possibility.

Because the lace suspender skirt that Zhang Mengyao was wearing when she was killed was most likely hers.

Then the problem is coming.

Zhang Mengyao didn't have a boyfriend at the time, so who did she go home with? And she had already left school.

The surveillance footage flashed by frame by frame, and every person entering and leaving the school was marked by Lu Chuan.

Soon, a total of four people were marked out.

After Lu Chuan called Zhang Hui over, he gave him the information of these four people directly.

"Brother Hui, go check on these people first. There were only these few people around when Zhang Mengyao left school that day. She left early."

After Zhang Hui got the surveillance screenshots of the four people, he said, "Huh? I know this person."

Among the four people, Zhang Hui pointed at a slightly plump middle-aged man and said.

After discovering Zhang Mengyao's body, Zhang Hui had already gotten a pretty good idea of ​​the situation at the Experimental Primary School. He had basically met all the teachers.

"Who is this?"

"Principal, he was the vice principal of the Experimental Primary School and was promoted to principal two years ago."

Lu Chuan nodded, but didn't care. He continued, "Also, let's see if we can check the staff members, including teachers and other staff, who asked for leave on the day Zhang Mengyao disappeared."

"Okay, I'll make arrangements right now."

When Lu Chuan finished checking the surveillance footage, it was already past four in the morning. Of course, he couldn't go to school at this time.

When they returned to the Hong Kong office, Liu Guorong and his colleagues did not go home this time. They had been busy all night and were now sleeping on the sofa, taking a temporary break.

There are a total of 4 sofas in the office now, and they are all occupied this time. I am thinking about not staying here anymore and going home.

Early the next morning.

Lu Chuan and Shen Yan go to work together.

"I'll send you to the Criminal Investigation Division first, and then I'll go to the Criminal Police Brigade to check."

Lu Chuan was just helping with the case, so naturally he couldn't not go to work at his own unit, but instead stayed in the Criminal Investigation Detachment.

"Row."

Shen Yan obviously hasn't had a good rest recently.

His eyes were a little red and swollen, and his eye bags were dark, and it was obvious that he didn't sleep well.

But Lu Chuan couldn't persuade him either. The only way to deal with such a murder case was to work overtime and stay up late, and no one in the entire team could get a good rest.

Zhang Hui from the Criminal Investigation Team did not go home last night. As soon as the sun rose, he went to the Experimental Primary School with the information of the people that Lu Chuan found yesterday. He verified what happened to these four people one by one. Why did they leave that day? Are there any witnesses there?

Time flies, and two days have passed in the blink of an eye.

Lu Chuan didn't go to the Criminal Investigation Detachment these two days, but Zhang Hui came to see him.

But seeing the other party's somewhat depressed expression, I knew that the investigation into the case might not have made much progress.

After pouring a glass of water for Zhang Hui, Lu Chuan asked, "How is it? What's the situation with those people?"

Zhang Hui shook his head.

"The principal went to the Education Bureau for a meeting. Among the other three people, one of the physical education teachers usually leaves early, another is the math teacher who asked for leave because of family matters, and the other is the cleaner who also asked for leave temporarily because of family matters."

To be honest, there are too few clues in this case. Zhang Hui originally thought that Lu Chuan provided him with some clues, and if he continued to investigate, he might get something.

But over the past two days, he has screened all the teachers and other staff who were not at school when Zhang Mengyao disappeared.

In the end, nothing was found. Those who asked for leave that day all had legitimate reasons and there were witnesses.

Lu Chuan sighed.

This is how solving a case works: sometimes all the clues have been searched and followed, but there is not always a good result.

"Now it all depends on Master's identification of the trace evidence."

Lu Chuan comforted Zhang Hui.

I was hoping that the murderer left some clues behind when he was working on the plaster.

Otherwise, this case would be really difficult.

Time passed quickly.

In the blink of an eye, another week passed. There were some small cases in the Criminal Police Brigade. Lu Chuan did not participate in it personally, but directly let several squadron leaders handle it.

The case at the Criminal Investigation Detachment is still moving forward, but other clues have basically stopped, and they are just doing some basic visits and investigations.

On the other hand, Liu Guodong and his colleagues have been staying up late to work overtime almost every day in the past week. After all, micro-interaction analysis is a meticulous job, and the amount this time is so large, so it is extremely difficult for them to do it.

This kind of thing must be done carefully and seriously without being careless. Otherwise, if you miss any clues, you might really miss the things left behind by the suspect.

Therefore, every experiment and every glass extraction requires close cooperation among several people, and they must do it seriously and not let their guard down at all.

On the 20th day after the incident.

Criminal Investigation Detachment, Yang Lin has not returned home since the incident.

I spend every day in the office, basically staying in the laboratory of No. 15 Middle School, working day after day with no end in sight.

But Lao Bai couldn't do that. He was old and his body couldn't take it, so in the next few days, Lao Bai basically went home to sleep at night.

"Yang Lin, the extraction of specimen No. 167 is almost done, you can use it to do this."

Yang Sen also worked overtime and stayed up late for twenty days. He was so busy that he had no time to trim his beard. Now he has a scruffy beard and looks haggard.

"Okay, I'll go right away."

Having just finished the identification and analysis of another specimen, Yang Lin quickly put the extracted specimen No. 167 into the instrument.

Extraction is relatively time-consuming in trace substance analysis, but once the extraction and corresponding pretreatment are completed, identification is relatively fast. (End of this chapter)