"If you don't give me an explanation today, I'll make trouble at the gate of your school every day from now on."

It was a middle-aged woman who spoke, a little bloated, with a spicy face, with a few people blocking the gate of the school, and a dark coffin not far away, wearing a white filial piety dress.

Principal Wang Zi was so anxious that he was sweating profusely, and kept explaining: "Liu An's death, the school will give you an explanation." The police have already started to investigate, can you please go back and wait first? Don't delay other students from school. ”

"Team Xiao, what's going on ahead? Why did the coffin still appear. Liu Xiaodong parked the car in the parking space near the school and said suspiciously.

"The family members came to ask for an explanation, it saves trouble, and you can take people back to the police station for interrogation in a while, they have caused social chaos by doing this." Xiao Yidao.

"Captain, you're so powerful, if you want to arrest someone, just say it, and what kind of social chaos is there." Liu Xiaodong admired Xiao Yi a little, he was not like this before, he went to the archives and became a lot of ghost ideas, can learning really change a person so quickly.

Xiao Yi looked at the situation at the school gate, stopped and said, "I'll go have breakfast, you go and solve it."

"Team...... Captain...... Just let me go......" Liu Xiaodong said with a little disbelief, he was wearing civilian clothes today, so in the past, others would definitely not believe that he was a policeman, maybe others would call the police.

"Go ahead, you go straight to the headmaster, I said hello to him yesterday." Xiao Yi said as he walked to the snack bar next to him.

"What are you doing around so many people, it's class time, and it's all dispersed." Liu Xiaodong said and took out his police ID card.

The spicy woman looked at the man in pale yellow clothes in front of her, looked at the police officer card in his hand with suspicious eyes, and a man in his early 20s next to him looked at Liu Xiaodong carefully and nodded at the woman.

Liu Xiaodong walked to the principal's side and said, "Open the door and let the students go to class first, it's not a matter for you to stalemate here."

"You are the mother of the deceased Liu An, we can understand your feelings, but your current behavior is to disrupt social order and affect our police case, you will go back to the police station with me in a while, there is a situation we need to ask you." Okay, let's spread it all out, and carry the coffin back. Liu Xiaodong waved his hand.

When Liu An's mother heard this, she was a little nervous and said, "I am the victim's mother...... You can't catch me, I'm ......"

Before she finished speaking, Liu Xiaodong's look made her stop crying. Subsequently, the school gates were opened, and the students who had gathered at the gate poured into the school.

Xiao Yi walked to the school gate and looked at Liu An's mother and said, "You are the mother of the deceased, do you suspect who killed Liu An......"

Her eyes flickered, and she replied, "I...... I don't know, but it must be someone from the school, my poor son, he's only 20 years old, and a great life has just begun. ”

"Okay, you go to the car and wait first, and then go to the police station later." Xiao Yi felt that this woman's mouth was full of lies, she must know something.

Xiao Yi said hello to the principal and walked into the school, all the way to the laboratory building, looked at the lock on the door, and asked the person cleaning next to him: "Auntie, I want to ask, the key to the laboratory building is generally in the teacher's hand."

The cleaning aunt stopped what she was doing. He looked up at the man in front of him and said, "The key is usually in the hands of the director of the Academic Affairs Office...... And who are you? ”

Xiao Yi thought that this kind of aunt usually has a title of "gossip king", as long as they are there, they know all the big and small things, so he asked: "Auntie, I am the police who came to investigate, I want to ask you something, which classmate do you think died was killed by whom?"

The aunt looked at Xiao Yi suspiciously, and it took a long time to recall that there seemed to be Xiao Yi among the police who came over yesterday...... A little hesitantly replied, "I said you can't arrest me."

Xiao Yi looked at her a little amusedly and said: "The police don't arrest everyone, citizens have the right to freedom of speech."

"The school died 3 years ago a transfer student in the first year of high school, but he committed suicide by jumping from the 6th floor in full view of everyone, and I heard that it has something to do with Liu An, who is now dead, so now it is rumored that the ghost of the boy killed Liu An." Aunt whispered.

Xiao Yi had a flash of inspiration, he seemed to understand something, but there was still a question that had not been answered.

"Do you know the details of the suicide three years ago?" Xiao Yidao.

"I probably remember that Liu An bullied the new transfer student, and the other party was a little autistic, so he committed suicide in the end, and I don't know the specific situation." Auntie thought for a moment and said.

Xiao Yi turned around and waved his hand, and walked directly towards the Academic Affairs Office, he was now completely sure that Liu An was definitely not killed by his three roommates, but one roommate must have been the first to find out that Liu An was killed, erasing the traces of murder for the murderer.

Entering the academic office, he saw a balding middle-aged man with glasses, looking down to process some materials. As soon as he saw Xiao Yi's arrival, he immediately stood up and said with a smile: "Officer Xiao, is there anything I can help you with?"

"The key to the gate of the laboratory building is with you, I want to know how many classes have entered the laboratory building in the past week." Xiao Yidao.

"Let me look it up...... In the past week, 3 classes have entered the laboratory building to do experiments, 2 classes have done physics experiments, and 1 class has done chemistry experiments. The Dean of Academic Affairs said.

"Liu An's class did a chemistry experiment on Monday, and the remaining two classes did a physics experiment."

"Who did the chemistry experiment?" Xiao Yi asked.

"It's chemistry teacher Ouyang Tian, and he led the class to do the experiment." Middle-aged humane.

"When did Ouyang Tian come to school?" Xiao Yidao.

"One year ago. He took the initiative to transfer to the school, and we were surprised at the time, he was a returnee, even if he went to teach at the university, it was more than wrong. The middle-aged man looked at Xiao Yi suspiciously and replied.

Xiao Yi went directly to the boys' dormitory after asking. Because of the murder, the school recently asked the people in this building to move to another building.

He searched room by room on the floor where the crime occurred alone, and although some things had been moved, he still left a lot of items.

Walking into the utility room, looking at the discarded beds and cabinets, he looked carefully, and suddenly he found a pair of footprints behind the door, and seeing that the size was not a student, he immediately picked up his mobile phone and took a picture.

He stood on an abandoned bed, mimicking the perspective of the owner of the footprints, and after many attempts, he finally found that there was an angle from which he could see the situation inside Liu An's dormitory door.

picked up his mobile phone and called Liu Xiaodong: "Are you still in school?"

Liu Xiaodong was copying the surveillance video of the last month when he heard his mobile phone ringing. As soon as he saw that it was Xiao Yi, he immediately answered the passage: "It's almost right, I'm leaving soon, is there anything wrong with the captain?"

"Now the utility room on the floor where I came to the crime scene, I'm waiting for you here, if I'm guessing correctly, this should be the first crime scene." Xiao Yidao.

As soon as Liu Xiaodong heard this, he pulled out the USB flash drive that had been copied and ran to the scene of the crime.

There was a lot of dust in the utility room, Xiao Yi stood outside the door and waited for Liu Xiaodong, constantly observing Liu An's dormitory, he was looking for an angle, an angle from which Liu An could come over and kill with one blow.

Liu Xiaodong looked at Xiao Yi a little panting, he didn't dare to disturb out loud. Because he understood that the captain was in the groove, he could only wait where he was.

"You walked over from Liu An's dormitory, remember coming over with doubts, a little vague, and absent-minded." Xiao Yi said.

Liu Xiaodong did so, and as soon as he walked into the utility room, Xiao Yi reached out directly from behind the door to cover his mouth, and then pressed his leg against Liu Xiaodong's waist, Liu Xiaodong's face was full of shock, he seemed to understand something, but the layer of window paper was not pierced.

Xiao Yi let go of Liu Xiaodong and left the men's dormitory building, preparing to return to the bureau.

"Captain, do you know who the murderer is?" Liu Xiaodong asked.

"Well, but now there's no evidence that he did it, he has a perfect alibi." Xiao Yi said lightly.

"Has Liu An's mother been sent back to the bureau?" Xiao Yi said again.

"I asked the other police officers to take her to the bureau first, because I wanted to copy the video, so I didn't let her wait for me." Liu Xiaodong said.

"Well, good job." Xiao Yi rarely praised it.

The second monk Liu Xiaodong was puzzled and wondered, "I didn't do anything?"

Xiao Yi looked at the time, it was almost 11 o'clock now, he also felt hungry, and said, "Let's go to lunch first, and then go back to the bureau."

He took out his mobile phone and called Liu Ruoyun: "Lao Liu is me, use the easiest way to do a paternity test for Liu An and his mother, I think I know who the murderer is."