At lunchtime, in the duty room of the criminal police detachment of District 1, Ai Jun, a young criminal police officer who had just joined the company, was grumbling with hunger, and it was time to change shifts in twenty minutes, and he could go to rest for a while.

Ai Jun is 25 years old, tall and thin, thick eyebrows raised, although he has the most ordinary inch hair, but it does not affect his handsomeness at all, he has just graduated from graduate school, after experiencing the 'devastation' of the public examination, he finally entered the coveted criminal police detachment, became a grassroots police officer, although the daily work is busy and hard, but he can enjoy it

"Get up, there's a case, come with me. ”

The person who came was an old criminal policeman with half-white hair Di Minglei, forty-nine years old, more than 20 years in the police, although he was nearly half a hundred years old, but full of energy, straight waist, prominent cheekbones, clear facial lines, presumably very handsome when he was young, and the whole person seemed to exude a resolute temperament.

"Good!" Ai Jun replied forcefully, not caring about being hungry, grabbing his coat and trotting all the way out with Di Minglei, and suddenly sat in the police car.

"A male corpse was found in the office building on the second street in District 1, and it seems that he can't rest at noon today. Although he couldn't rest, Di Minglei's tone was still a little relaxed, and then, he took out a sandwich from the plastic bag in his hand and threw it to Ai Jun, "Haven't eaten yet, take one to pad your stomach a little, the situation at the scene is still unclear, I don't know when I can come back." ”

Di Minglei is Ai Jun's partner and his master, and he has just entered the police force and partnered with an experienced veteran police officer, which can't help but make Ai Jun feel nervous, but in fact, Di Minglei always guides the work of this junior like a loving father, so Ai Jun feels very lucky.

"Team Di, it's not going to be overtime again, is it? There have been several such incidents this month. Ai Jun asked as he nibbled on his sandwich.

"I don't know the specifics. And you remember, don't guess before you see the scene, otherwise you will have a preconceived idea of the whole event. Di Minglei said in a serious tone.

"Got it!" Ai Jun replied firmly, ate the remaining sandwiches in two or three bites, sat upright in the co-pilot's seat, and began to imagine what the scene would look like in his mind.

The police station was not far from the scene of the crime, and the road was in good condition, and five minutes later, the two arrived at the scene along with the medical examiner.

There was some chaos in the office building, the police at the scene used a yellow cordon to isolate the scene from the crowd of onlookers, and tried to maintain order at the scene.

"Can the identity of the deceased be confirmed?" Di Minglei asked the police officers at the scene about the situation.

"The deceased, Wu Ming, male, 32 years old, was an employee of the company on the 23rd floor of the building, and the informant was an employee of the company on the 19th floor of the building, who did not know the deceased, and our colleagues were making a record of her. The officer looked at the notes in his hand and replied with a serious expression.

"Well, I know, I'll leave it to us first, you go back to the office to find the information of the deceased, and then notify the family. ”

The officer nodded, turned and walked away quickly.

The forensic doctor is conducting a preliminary autopsy, and it will be some time before the results are available, and Di Minglei and Ai Jun are carefully searching for evidence at the scene.

There are no windows in the staircase of the fire escape, and even during the day, the light in the stairwell is very dim, and after a whole search, the only useful evidence is that the deceased's mobile phone was dropped not far away, and it has been automatically turned off because of the lack of power.

"Team Di, this is a little strange, the building itself has an elevator, why did the deceased still appear in the fire escape. Ai Jun frowned, thought for a while, and said.

Di Minglei also frowned and felt that something was indeed a little strange, so he ordered Ai Jun: "You go and retrieve the surveillance video of the 23rd floor in the past few days now to see when the deceased left and why he entered the fire escape." ”

"Yes!" Ai Jun had already started to act before his words fell, which made Di Minglei very satisfied, young people are energetic, vigorous and resolute, very much his demeanor back then.

Di Minglei was not idle, and went directly to the 23rd floor to Wu Ming's company, hoping to learn something from his colleagues.

But after a long time of inquiry and investigation, Di Minglei found that the deceased's popularity among colleagues was surprisingly good, thoughtful, helpful, and did not have any bad habits, and because he was very hard working and highly motivated, he also left a good impression in the eyes of the boss.

According to the deceased's colleagues, the deceased was always the last to leave the company every day, and last night was no exception, supposedly to rush a very urgent project, and had prepared instant noodles and bread in advance, seemingly ready to fight until late at night.

At this time, the medical examiner also came with news that the cause of death was a fractured cervical vertebrae, and the time of death of the deceased was between half past two and three in the morning, and there were no obvious external injuries other than that, and other information could not be obtained until further autopsy.

Di Minglei sorted out his thoughts, according to the current evidence, the whole incident seems to be very clear, the suspect came home from work late at night, and accidentally fell down the stairs on the way downstairs, causing a broken cervical vertebrae, and finally died, and even the preliminary investigation can rule out that he was killed.

But Di Minglei's criminal police intuition for many years told him that things are definitely not as simple as they seem, and there must be some complicated clues that have not been discovered, and now the most urgent thing is to find out why the deceased chose to go downstairs from the fire ladder, and to get in touch with the deceased's family as soon as possible to understand the deceased's family situation.

"Hey, Team Di, I'm Ai Jun, I found something here on the 23rd floor, come and take a look." ”

Hearing the voice from the walkie-talkie, Di Minglei quickly rushed to the monitoring room on the 23rd floor in three steps and two steps, and as soon as he entered, he saw Ai Jun facing a huge computer display screen with a solemn face.

"Team Di, I have investigated, the monitoring in the various passages and elevators of this building is under the general control of the building, but the monitoring in each company is under the independent control of each company, so I found ...... when I investigated the monitoring of the deceased company" Ai Jun held the mouse and quickly found the useful parts, "Look here." ”

Di Minglei's eyes were glued to the surveillance video, at 2:40 in the morning, Wu Ming was still working hard in the office, but at 2:41, all the surveillance clips were lost together, and when the surveillance video was restored at 2:46, Wu Ming had already left.

"How can this be? Have you found out the reason?" Di Minglei frowned tightly, and there was a new situation in the matter.

"Not yet, I'll do my best to investigate. After Wu Ming left the company office, there were still two monitoring devices in the elevator room, but I needed to go to the main monitoring room on the first floor to see them. ”

"Come with me now. ”

The two moved quickly, and soon reached the first floor, Di Minglei also paid a little attention to it, it takes at least five minutes for a normal man to take the stairs from the 23rd floor to the surveillance video room at a fast speed.

In the total monitoring room, dozens of large and small machines are stacked together, and the display screen is densely packed with a whole wall.

"Team Di, I've found the video of the elevator room on the 23rd floor!"

Di Minglei and Ai Jun squeezed in front of a small screen, and found that at 2:44, the deceased Wu Ming walked out of the company and arrived at the location of the elevator room, but even pressed the elevator a few times and seemed to have no response, and then Wu Ming turned around and walked into the fire elevator.

"This elevator ......" Di Minglei clasped his hands to his chest, his brain was running rapidly, "You back up all these surveillances, and then go to the elevator control room to see if there are any clues, and then close the team, go back to the bureau to see if the reporter and the family of the deceased can provide some clues, this matter must not be simple." ”

......

The criminal police detachment of District 1, before entering the office building, Di Minglei and Ai Jun heard a heart-rending and sharp cry of a woman, which was very miserable, which made their hearts tremble.

On the seat in the hall, there was a very haggard woman, her hair looked a little messy, she was wearing a homely plain dress, her eyes were swollen from crying, and beside her, there was a child who looked like she was only three years old, the child was too young, and she didn't know what was going on, just quietly snuggled up to her mother's side, on the other side, Chen Jing, the policewoman in charge of logistics in the police force, was trying her best to appease the woman's mood, and when she saw Di Minglei coming back, she could only signal with her eyes that he could not ask about the situation for the time being. 、

Seeing this, the two did not stay long, and returned to the office to sort out the evidence.

According to the informant's record, she was an employee of a company on the 20th floor of the building, and she wanted to go downstairs to buy food during her lunch break, but it happened that there were too many people using the elevator, so she chose to take the stairs in order to save time. The deceased was found a few floors later. Ai Jun looked at the transcript sent by his colleague and relayed it to Di Minglei word by word.

"This makes sense, but the problem is that the deceased left the company at about 2:40, I don't think there will be too many people using the elevator at any time, even if one is being used, there are a total of four elevators in the entire elevator room, and there will be idle after all, so why would an extremely tired person give up this labor-saving method and choose to take the stairs. ”

Di Minglei clenched his fist with one hand, tapping his head rhythmically and slightly, and walked up and down the soles of his feet, hoping to burst out a little inspiration.

"Judging from the surveillance of the building, the deceased did try to use the elevator, but the elevator did not seem to work, so the deceased chose the stairs instead. ”

"I can't use it...... I'm afraid someone has tampered with it, so did you find anything in the control room? I suspect that someone deliberately sabotaged the power system, causing the elevator to stop running, and the surveillance on the 23rd floor was also missing at 2:41?"

"In the control room...... I didn't find anything," Ai Jun said with a sigh as he lowered his head, and I found that the elevator and lighting equipment in this building belong to different lines, even if the building has a power outage, the elevator will automatically switch to a backup circuit to ensure its normal use.

Ai Jun finished speaking in one breath, and continued to add with a sigh of relief, "But when I backed up the surveillance, I found that there were four surveillances that lost all the video data from 2:54 today, I have seen it, the surveillance of this building cannot delete a single fragment, but can only delete everything together, this must be done by someone to cover up something." ”