This was very strange to us, so we went to the security guard again and asked him again if there really was only one entrance to the school during the holidays.

The security guard insisted that there was no other entrance.

But this is obviously impossible. Because judging from the monitoring probe, when Zhang Yucai entered the school, the students who had already entered it before had already come out one after another. And their physical characteristics are very obvious, so we can easily see their appearance.

In this case, there are three possibilities:

The first possibility is that it is not as the security guard said, there should be other entrances and exits to this school, but this entrance and exit is very hidden, they don't know about it, only some students know about it. This type of entrance and exit is either through the wall or through a small hole in one of the walls of the school.

The second possibility is that when Zhang Yucai entered the school, there were people in the classroom. But these people are not the same school they entered today, but they have been staying in the school since yesterday!

The third possibility, which is very simple and crude, is that the murderer is one of the school staff during the holidays! He took the opportunity to kill Zhang Yucai and did not appear in the surveillance probe at the school gate.

I rule out the third possibility for now. According to our investigation, most of the employees at the school are relatively old people, and even if they have the possibility of killing, they cannot have enough strength to carry Zhang Yucai from the ground floor to the fifth floor.

In addition, none of the staff at the school matched the physical characteristics of the suspect we saw in classroom 503, so we had good reason to rule out this possibility.

Now, then, only the first two are likely to be more convincing.

I asked the security guard again if their school was a boarding school, and he replied, "The boarders at this school are called home after the holidays." Although it is only a short time since the holidays have begun, our school should be free of boarders now. They all went back. ”

"Is it possible that the student sneaks back and lives in his dorm secretly?"

"Impossible. Because the entrance of each dormitory is guarded by the dormitory staff every day, this will continue until the end of the holiday. So if someone went back to the dorm at night, they would know about it. ”

Hearing the security guard's words, Ouyang Qian and I looked at each other, then nodded tacitly, and walked towards the dormitory of this school together.

After our inquiry, from yesterday to now, none of the dormitory staff guarding the door of the dormitory have seen any students return to the dormitory.

"In that case, we can temporarily determine that the murderer should have entered this school from the outside, right?" Ouyang Qian said with her notebook in her hand.

"No," I said, touching my chin slightly, "not necessarily. Because we can't send a murderer to spend the night in a classroom. Even if the school's security guards check the classrooms or hallways every night, if someone is familiar with the environment of the school building, he is likely to escape the inspection. ”

After listening to my words, Ouyang Qian helplessly wiped the sweat on her head, and said a little irritably: "Then what should I do!" Now the staff has also finished the investigation, students, relatives, colleagues and so on, we have all asked, and they all said that there is nothing wrong with this teacher! How could such a person be killed, there is really no motive to be found! ”

Seeing her so anxious, I also smiled bitterly, touched her head and said: "Yes, but things are so coincidental, when the murderer committed the crime, there were no eyewitnesses, although the surveillance probe took a video of the suspect, but we can't get clear physical characteristics." ”

"That's where we need to peel back the threads." I pulled her by the way, calmed her mind, and threw herself into our next round of thinking.

"Why don't we go back to the scene and have a look?" Ouyang Qian proposed.

"Fifth floor...... It's such a hot day...... "I was so frightened when I heard that I quickly refused.

"Oh, come on, didn't you just say that you want to peel off the cocoon and devote yourself to the next round of thinking, come on, maybe we will find a new clue!"

I couldn't resist the woman in front of me, so I had to get out of her, and she pulled me back to the classroom on the fifth floor.

Coincidentally, we came to this classroom at about the same time as we first received the report, around two o'clock, so the heat in the classroom is still very high. And because it has been closed for a long time and there is no ventilation, the air inside makes people smell very uncomfortable.

We got into the cordon outside and came to the place where the body was lying.

I suddenly remembered a question I had when I was looking at the surveillance, which was: Why did the murderer put the body here?

According to the footage we saw in the surveillance, the suspect wearing the mask first dragged the body into the classroom podium, then rested on the podium for a while before dragging the body to this position, and looked left and right for a while before leaving the place.

It is clear that the suspect deliberately wanted to place the body here, and there must be some kind of meaning to this. This kind of ritual is very suspicious.

I paced to the vicinity of the corpse, then looked in the direction of the corpse and saw that it was outside the window. If you go outside the window......

I walked to the window and looked out from the window. Since the fifth floor is already the classroom on the top floor, and this classroom is relatively backward, just under the corner of the top balcony, so you can see the balcony on the top floor of the teaching building at a glance from this place, and the situation above can also be seen clearly.

Seeing this situation, my heart was shocked, could it be that the murderer just wanted to send us a message in this way?

"Shao Team ......"

Ouyang Qian's words rang in my ears, but at this time I was thinking about what the message of the balcony could convey.

"Shao Team ......"

"Wait a minute, Xiao Qian, I'm still thinking about it......" I couldn't help but interrupt Ouyang Qian's words.

But instead of accosting me, she suddenly tapped me on the shoulder, and I was about to get angry, but when I turned around, I found that she was holding a small, pink note in her hand.