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Three or five groups of students holding textbooks chatted enthusiastically. As they walked down the stairs to the fourth floor and were about to turn into the corridor, a student suddenly pointed at the stairway on the fourth floor leading to the fifth floor: "咦That's right, footprints? "

"What?" The student's words immediately aroused the curiosity of others, and everyone came together and looked in the direction he was pointing.

The stairwell was darkened, and there was a particularly noticeable footprint on the second step of the staircase.

Several students looked up the steps and saw that there was a footprint on every other step, and all were left.

A few students were curious first, and when they reacted, they felt cold all over, because after the stairs from the fourth floor up were covered by the iron railings, the iron railings reached the roof and were dense, whether it was drilling or Climbing, people are unbearable.

And those footprints are barefoot.

A few students were taken aback. Someone screamed and ran downstairs, just hitting the chemistry teacher who had just arrived.

The chemistry teacher reprimanded: "What's going on, how many times have you said not to chase in the hallway of the teaching building, why don't you just listen and what to do if something goes wrong?"

The student stuttered pointing upstairs and said, "Teacher, where is there ... there is ..."

After half a day, he couldn't tell what it was. The chemistry teacher wondered, and simply said, "If you have anything, come with me and go to class soon. This experiment is more troublesome. If you delay time, you can't finish a class. "

The student obediently followed the chemistry teacher and went upstairs. At this time, there were more people around the stairs on the fourth floor. The students who had already entered the laboratory listened to the noisy movements outside and came out for fun.

Because there were so many people and the tense atmosphere was reduced, people who were scared began to guess what was going on in that footprint.

A student joked: "Can this thief just take off his shoes and hop on two steps?"

The others laughed.

The chemistry teacher came to see so many people around here, and said angrily, "It's all going to class. Can't you stay in the laboratory and familiarize yourself with the experimental procedures and experimental equipment? Will you all do the experiments? The reports will be written?"

When everyone saw the teacher coming, they immediately corrected their posture.

Someone said, "Teacher! The thief has been recruited in the experimental building!"

"Thief?" The chemistry teacher frowned. "Where's the thief, what can be stolen from the experimental building?"

The student said, "Teacher, our experimental instruments are quite valuable. In case the thief is aware of this, you see, there are still footprints in the staircase from the fourth floor to the fifth floor!"

The chemistry teacher looked at it and saw the lonely footprints. It was not strange in her heart, but when she thought that if it was a thief, the school would lose a lot. She saw it but did not deal with it.

So she asked the student to give in and told the lab teacher on duty today. The lab teacher heard that he came over with the key leading to the fifth floor. The students dispersed automatically and the teacher opened the huge chain that locked the iron chains together. Iron lock, opened the iron fence door.

The chemistry teacher asked the students to go back to the laboratory to wait, while they went upstairs with the laboratory teacher to watch.

A tall male student said, "Teacher, let me go with you. If you really are a thief and the thief hasn't left, bring a few strong boys to be safe."

The chemistry teacher thought of this, and nodded: "Okay, thank you. Ask a few boys to join me."

Several boys came out and followed the chemistry teacher upstairs. Although others were curious, they obeyed the arrangement and returned to the laboratory to wait.

The chemistry teacher and the laboratory teacher walked in front, with a few boys following, and they all avoided the barefoot footprints by coincidence.

Turning down the stairs into the laboratory corridor, they found that the one-footed footprint had been turned into a laboratory.

The lab teacher wiped the sweat that burst from his head: "This lab is the lab where the teacher had an accident ..."

The chemistry teacher paused. "Go in and see."

"No," the lab teacher shook his head. "A key is needed."

She continued: "I'll go down and get the keys, you guys wait here." After that, I went downstairs.

The hallway was extremely quiet, the needles could be heard, and the white floor was covered with taupe dust, and the string of left-foot-only footprints that stretched towards the laboratory was extremely clear and weird.

A male student swallowed: "I think, it's not like a thief."

The person next to him hit him: "During the day, don't talk nonsense."

Soon, the lab teacher returned with a bunch of keys in his hand.

Because it was useless for too long, there was some rust on the key, and it was very difficult to insert it into the keyhole. The others didn't talk anymore. This key is too difficult ... "

The door opens.

Her words stopped abruptly.

The chemistry teacher took a deep breath while covering her mouth.

"Teacher, what's wrong?" The students behind were puzzled because they were taller and looked over the two teachers.

The air is frozen.

The boy lost all his blood, and took two steps back.

There was a mess in the laboratory. The dust on the ground was fused with the solidified black and red blood, and the footprints of one foot changed from clear to mixed with blood, spreading throughout the laboratory.

In the middle of the laboratory, a boy was sitting there with a rope around his neck, and the other end of the rope was tied to a chandelier above his head, barely holding his body. His upper and lower eyelids were each stretched by a short bamboo stick, and the ends of the bamboo stick were inserted into the meat, exuding a little blood.

A microscope was placed on the experimental table, and the deceased's glazed eyes were staring straight at the microscope in front of him. The whole person acted as if he was doing a serious experiment. On the microscope stage, a slice of thin, thin, cicada-shaped meat was placed.

Such pieces of meat are evenly lined up in a container on the side of the microscope. They are cut to a similar thickness and look very fresh. The right side of the container is a divided right leg. The thigh is missing a piece of meat. The piece of meat is cut off and placed on the other side. A knife is inserted on it to keep the cut. It looks like the cut piece of meat looks exactly the same as those seen under a microscope.

The deceased sitting in the chair was missing a right leg.