In the security office, Son stomped on the extinguished cigarette butt.

"The footprints in the toilet are too messy to extract anything of value."

"I also visited the nearby photo development shop, but I didn't find anything."

Several young police officers around Son Masayoshi reported:

"After a morning of investigation, the possibility of off-campus personnel and students committing crimes has been basically ruled out, and now only the staff and teachers are left without investigation."

"How do you rule out suspicion?" Lin Fan couldn't help but interject.

"Due to the horror incident in the women's toilet on campus, a large number of female students crowded into the toilet inside the teaching building, so if someone wants to take a secret film, they must sneak in in advance during class time, and a lot of my work in the morning is to investigate to see if there are any boys who are not in the class during class time." One of the officers said, "Unfortunately, no one who meets the requirements has been found for the time being." ”

"I was in charge of checking the people outside the school in the morning," another police officer continued, "Due to the clandestine photography incident a while ago, now the security guards are very strict with the entry and exit of people outside the school, explain the reason, and they will only be released after detailed registration. ”

After listening to the analysis of several people, Sun Zhengyi walked to the window, looked out, and said after a moment of silence: "Then check the staff and teachers who are about 180 tall and have a shoe size of 43." ”

He turned around and looked at Lin Fan, "I'm sorry, I can only help you so much, you don't know the situation in the team recently, such a small case is estimated not to even be filed, we can only take out a day today to help you investigate, I hope to find something among the staff and teachers." ”

"Yes. Excuse me. ”

After expressing his gratitude, Lin Fan secretly recalled the scene of the murder prank yesterday morning, and faintly felt that something was wrong, and this feeling was very strong. It's just that he can't grasp what it is for a while.

Throughout the afternoon, Lin Fan shuttled through various teaching buildings, playgrounds, reading rooms, and canteens, tirelessly observing everyone who might meet those conditions.

He returned to the women's restroom on campus. Carefully figure out the psychology of the other party.

If the two things were done by the same person, then the first prank may have something else to say.

It's not just some kind of intimidation, it's a kind of sheep trapping.

Because of the horrors that took place here, all the girls were pushed to the other side by the invisible sense of fear, which meant that they would only choose the restrooms inside the school building.

The only option was probably exactly what the demon wanted, and there were partitions in front of each compartment in the bathroom inside the teaching building, forming an independent and confined space, just right for him to hide.

Unlike the women's restrooms on campus, he lurks in his cubicle undetected. Instead, it's easier to take a candid shot from the gap between the two compartments.

It's just that a man has been hiding in the women's toilet for a long time, which is very easy to be discovered, especially now that it is still a special period, and the long queue in the women's toilet in the teaching building has overtaken the canteen at 12 o'clock at noon.

Suddenly, a bold guess crossed his mind.

He stood in front of the wall that had once been drenched in blood, closed his eyes, and reached out to trace the faint blood-red color.

Relative to 180 people, the position and height are clearly wrong.

Will it be that kind of special? There was a deviation in height and foot length. Or was it the possibility that he couldn't believe?

He frowned and typed down a text message.

Physical Evidence Identification Center of the Municipal Bureau.

"What result?" Xin Chen cast an inquiring glance at the man beside him.

"I risked being criticized by the leaders above to help you cut the queue, how about it. Have a dinner together at night? The man glanced at Xin Chen expectantly.

"I'm not free, hurry up and get down to business!" Xin Chen replied impatiently.

The man sighed. Said helplessly: "Okay, then next time." ”

"Hmm." Xin Chen nodded in response, her eyes already focused on the few printed analysis documents on the table.

"From the analysis of the extracted footprints, this person is wearing shoes that are size 43 and should be about 1.8 meters tall. However, its step width is short and narrow, and the landing pressure is uneven. The light and heavy pressures are inconsistent, and the footprint line is slightly outward. ”

"What do you mean?" Xin Chen didn't understand too much.

The man smiled proudly, he was an expert in this area, and of course he had to show off in front of such a beautiful girl.

"Not surprisingly, the above characteristics are all manifested as the footprints of a thin and frail middle-aged and elderly person."

"Impossible." Xin Chen denied the man's judgment for the first time. Elderly? Such an age simply does not correspond to the psychological characteristics of the offenders in the two cases on campus.

That kind of full emotion is not what this negative age should have.

"Is there any other possibility?" Xin Chen asked, "For example, there is a discrepancy between the correlation between foot length and height. ”

"This may exist, but it will not affect the characteristics of the footprints, such as front and back light pressure, focus point, etc." The man thought for a moment and tapped the table a few times, "But you reminded me that I thought of another possibility, you look at these footprints, the weight point is shifted to the relative back, the edge of the footprint is more incomplete, the front tip is larger than the other parts of the edge, and the pick marks are heavier." ”

"What does that mean?" Xin Chen looked up at him.

"Small feet wear big shoes, and they themselves probably should be under thirty-eight in size." The man nodded to Xin Chen.

Xin Chen was secretly surprised, "So his height can't be 180!" ”

"Yes, if our inference is correct, he should be around 165 tall." The man picked up the sample of footprints on the table and looked at it carefully for a moment, "And based on the step size of these two footprints, I have a bolder inference." ”

The man paused for a moment, his eyes suddenly flashing, "She could be a woman, a woman less than 165 tall." ”

"What? A woman! Xin Chen was dumbfounded.

……

Lin Fan received a text message from Xin Chen in physics class.

Although he had faintly sensed this possibility just now, he still couldn't believe it at this moment.

"How's it going, did you find anything?" Mo Feng asked in a low voice, he saw the growing doubt in Lin Fan's eyes, and felt the seriousness of the situation.

"In the past few days, I have asked your relationship to help me check whether there are any such girls or teachers in the school, a few key points:

First, she has a withdrawn personality and is about 165 tall, and second, she may have had some bad experiences; third, she may be a boarding student; Fourth, the recent viral campus unthinkable incident may have something to do with her. ”

"Is there a fifth point?" Mo Feng added; "Maybe it has something to do with Susan?"

Lin Fan nodded, "There is also this possibility, anyway, hurry up and find it." ”

There were still many clues that could not be strung together, and there was a strong uneasiness that always occupied his heart, and he always felt as if he was being guided by someone or secretly peeping.

When the school bell rang, in the bustling crowd of departures, Qin Rao's desire to speak stopped.

Outside the window, the sky was low and dark clouds were rolling. (To be continued......)