In the early morning of January 31, the quiet campus of Linyang No. 1 Middle School was shrouded in morning fog, the campus was already lit up, and the high school students got up early and were already studying in the morning.

Yang Kang parked the police car in front of the magnificent wall gate of Linyang No. 1 Middle School, and honked the horn, the doorman security guard has been very familiar with this police car in the past few days, and waved to Yang Kang in the gatehouse:

"Officer, it's hard work, I'm here to investigate the case again."

The telescopic fence slowly opened, Yang Kang pulled down the window, nodded to the security guard with a smile and said:

"You always watch the door every day, just as hard."

The security guard looked at the police car driving into the campus, lowered his head and sighed softly:

"When will this messy day be a head?"

Yang Kang turned off the siren of the police car to avoid noisy students who were quietly studying in the school, as a key middle school in Linyang City, students here have to attend classes in less than ten days after the winter vacation, and the learning pressure can be described as very great.

Yang Kang's police car drove into the parking lot next to the small flower bed in the school and stopped, he pushed open the door and got out of the car, just in time to see a slender policewoman wearing a black jacket waiting for him by leaning on the flower bed.

The policewoman lowered her head as if she was thinking about something, her face was cold, her eyebrows were plain, and she had a pair of clear apricot eyes, she was a cold beauty who came out of the mud and was not stained.

"Long time no see, Ruyue." Yang Kang grinned and stepped forward to say hello.

"The last time we saw each other was 26 hours ago, so why haven't we seen each other for a long time? And don't call me Ruyue, we don't know each other that well. The policewoman said coldly, but she didn't look very disgusted with Yang Kang's title.

"Just like Miss Yue, I haven't seen you for a day like every other autumn, but I'm always thinking about whether I can sublimate my noble revolutionary friendship with you one day." Yang Kang said with a pompous smile.

"You've seen too much of the dragon hunt, right? I also sublimated revolutionary friendship, I came to you with something very important to discuss. About the case of disappearance three days ago. The policewoman frowned like a moon, and directly filtered out Yang Kang's white rotten words.

"Is there any point in investigating the so-called disappearance? A few days ago, I asked the classmates of the three missing girls here, and found that these three little girls were not the masters of Ansheng in the first place, maybe they just ran away from home, and after a few days, they found that the cold society was far from the warmth of the family's comfort nest, so they returned to the ivory tower built by their parents and the school. Yang Kang no longer wants to continue to investigate this so-called "missing case", compared to the murder and car explosion on the pedestrian street, the express car in the suburbs, and the 128 corpses in the hospital, the disappearance of these three girls is really insignificant, and now the three brigades of the Linyang City Public Security Bureau, only the captain of the third brigade in front of him, Wan Ruyue, and a few police officers are investigating this "small case" relentlessly, if it were not for the identity of Yang Police Flower in the moon, Yang Kang would not have come to this school again at her invitation.

"They can't have run away from home, they're definitely missing, and if we give up the investigation, we might find their bodies in a few days." Wanyue said seriously.

"Oh? How so? Yang Kang asked a little more seriously.

"Have you investigated the school's surveillance?" Wan Ruyue did not answer directly.

"Of course I will investigate, I checked all the cameras in the school, except for the three little girls in front of Building No. 6 of the girls' dormitory at half past 11 o'clock in the evening on January 27, the back of the three little girls sneaking out of the dormitory aunt, all the other cameras have found nothing, it seems that these little girls have investigated the location of the cameras in the school in advance, except for the camera at the door of the dormitory, the other cameras have deliberately avoided." When Yang Kang came to this conclusion at that time, he immediately admired the eccentric minds of the children now.

"I'm afraid you've missed a camera, the most critical camera." Just like the moon said.

Just like the moon took Yang Kang to the school's monitoring center again, Linyang No. 1 Middle School in order to "better, more comprehensive" management of students, basically in the school in addition to the toilet in various places have set up cameras, sometimes a few class teachers will come here to observe their classrooms through the camera, if there are students sleeping in class and playing with mobile phones, the head teacher will immediately rush over the students to catch a square, when the two policemen arrived at the monitoring room, they just saw a short and fat middle-aged head teacher was bending over in front of the camera monitoring screen, The technician who manages the school network, the glasses tech nerd Cui teacher is chatting.

"Eh, Mr. Ren, are you observing the students here again?" Yang Kang happened to know this teacher, who was the head teacher of the three missing girls, he was a little bald, only 1.55 meters tall, which was considered a second-class cripple among men, but this teacher was extraordinarily confident, talking endlessly, his personality was very strong, and he never admitted defeat, Yang Kang listened to other teachers in this school say that this teacher Ren advocates high-pressure policy management of students, and believes that as long as strict supervision and punishment measures are passed, students can be driven to have stronger motivation to learn, and the three girls under his management, But they were very unsupportive of this teacher's management strategy.

There have been three girls in the class who have been missing for three days, and this teacher, who usually looks very energetic, seems to have aged a lot in a few days, and there are a few more strands of white hair in the black hair that is usually well groomed, and when he saw Yang Kang, Teacher Ren was also stunned, and then put a warm smile on his face:

"It's Officer Yang! Long time no see, long time no see. The two shook hands, Teacher Ren is not tall, but his hands are very powerful.

"Officer, Anya, Qiao Nan, and Shen Jiayi, have you found any clues now?" Teacher Ren made no secret of her concern and concern for the students, "Although these three girls don't usually listen to me, they are still very good, and I really don't want anything to happen to them." ”

"I haven't found any clues yet, but the officer next to me seems to have found something, so I came over with her to take a look." Yang Kang pointed to the beautiful moon standing beside him.

"Mr. Cui, show them the restored surveillance video." Like a moon, she said softly to Teacher Cui, who was calling up the surveillance video.

"Oh, these are indeed very important clues, and it was my dereliction of duty that I ignored them at the time." Teacher Cui clicked on a folder on the desktop that Yang Kang had never seen when he used this computer to check the monitoring before, and there were dozens of surveillance videos in it, all of which Yang Kang had never seen before.

"I've checked all the surveillance, when did I have so many videos?" Yang Kang remembered that a few days ago, he and several of his police officers took turns to watch all the surveillance videos of the school after half past eleven that night, and they were dizzy.

"This is the monitoring of the old teaching building that was abandoned eight years ago, the school is now replaced with a new teaching building, and a lot of new cameras are installed, but all the circuits of the school's surveillance cameras are connected together, and the monitoring of the old school building is still running with other new cameras, but the monitoring of the old teaching building with no one is completely meaningless, and it wastes our disk space, so I specially compiled a program, as long as it is a video from the old teaching building, all will be automatically and completely deleted, So you didn't see these videos when you were investigating the case, and now these videos are all data that I restored at the insistence of Officer Wan, but I didn't expect to really find clues in them. Teacher Cui explained to everyone with a wry smile.

"Why didn't you say it earlier! I was so busy all day! Yang Kang suddenly became angry.

"I didn't expect these girls to go to the old school building to explore, that school building has not been entered for several years, maybe it will be demolished this year, what am I still paying attention to it for?" Teacher Cui explained helplessly.

"If it was the three of them who were troublemakers, it was really possible that they used to like to play with pen fairies, saucer fairies, and weird things in the four corners in the class, and they put detective novels and scary magazine......s all over the classroom desks," Teacher Ren added.

"Teacher Ren, it's not good to rummage over students' desks, you are violating students' privacy." Yang Kang reminded Teacher Ren.

"How old they are, they don't understand anything, I'm just for their good......" Teacher Ren blushed and lowered his voice.

"Teacher Cui, let's release the two videos in question to them." Just like the moon said.

Teacher Cui clicked on the first video taken in front of the gate of the old teaching building:

In front of the six-story old teaching building that looks particularly gloomy in the dark night, three smiling girls are standing at the door, led by a short-haired girl with a flashlight and swaying around, Yang Kang has seen her information in the file, her name is Anya, 17 years old, it seems to be a sports student, and a girl with glasses in the middle is looking down and playing with her mobile phone, it is Shen Jiayi, 16 years old, the only student among the three girls, and a beautiful girl with long hair who walks at the end is holding a SLR and taking pictures everywhere, her name is Qiao Nan, 17 years old, an art student.

They don't look like they're here to explore, but like they're here for an outing.

"Carrying a mobile phone and a video camera behind my back, it's just lawless!" Teacher Ren was indignantly counted down these girls who had violated discipline.

The first petite girl with short hair and a kitten hairpin raised a flashlight to shine at the window above the old school building, as if she saw something, suddenly lost her smile, and said something to the two friends with a somewhat uneasy look, but under the comfort and push of the two friends who didn't care about the smile, the three girls finally entered the old school building.

"What did they say, why is there no sound?" The surveillance videos that Yang Kang checked before were all recorded with sound, but now watching this video looks like watching a silent movie, and the clarity is also very poor, and the girl's face can't be seen clearly.

"It's a miracle that this is an old camera from eight years ago, low resolution, no recording, and it's still running, so how can we update these cameras that don't exist at all?" Teacher Cui explained.

"There is another suspicion here, I asked the security guard on the school patrol, the old school building is equipped with a door lock, but these girls don't know how to get the key, check the whole school, there is no place to lose the key to the old school building, the old school building key is now only three in the whole school, there is a patrol security guard, the principal has a hand, the warehouse security office has a hand, all in place." Wan Ruyue added.

"It's kind of interesting, it looks like they never came out as soon as they went in, right?" Yang Kang's gaze sharpened.

"Now let's look at the second video, this one is even stranger, they were captured for a short time, only three seconds, in the corridor of the classroom on the second floor of the old school building." Teacher Cui opened the second video:

Anya, who has short hair, and Qiao Nan, who has long hair, have panicked faces and stumble across the aisle, and then something seems to flash in front of the camera, and then nothing is captured again.

"Why are there only two girls left? What about Shen Jiayi? Yang Kang asked.

"Either they're scattered, or they're ...... It's that she doesn't have a chance to escape. Ruyue replied in a heavy tone.

"This video is short, but the frame rate is high, we can slow it down and you will find something even weirder." Teacher Cui spoke in a strange tone.

He pulls up a piece of software and slows the video twenty times down, frame by frame, and the world feels like it's in slow motion, and people gradually see what flashes in front of the camera.

White, somewhat blurry, galloping......

"The white fox?" Teacher Ren cried out, as if he had seen the most terrible thing in the world.

From today onwards, there will be one shift a day, the school will start, and I will be busy, and I will not have time to change two shifts a day