We have narrowed the professional identity of the killer to include working at height and climbing abseiling.

The next thing we have to do is to continue narrowing this down.

"The killer was also familiar with the structure of the building, otherwise he would not have known that there was a fire hydrant on the roof that could be lowered." Li Meng then added.

The technical team's on-site investigation has been completed and we are ready to evacuate the scene of the crime together.

Instead of choosing the elevator we came to, we chose to take the fire escape.

Even if the murderer descended from the rooftop rope, it was impossible to fly directly to the rooftop, and the murderer either chose the stairs or the elevator.

And both ways to get to the rooftop are monitored on the way.

Together with the technical team, we chose to take the stairs down from the 50th floor to the first floor.

It's easy to go up the mountain and hard to go down, it's not bad at all, the stairwell of each staircase is the same, we keep repeating the same thing, some are in a trance, and we suspect that we have encountered a ghost hitting the wall.

This state of hazy consciousness can cause restlessness and nervousness in people's hearts.

But we are criminal police, and the facts of the case are orders, and we must overcome all difficulties and work hard to do a good job in the investigation of the scene.

We conducted a careful site survey of the stairs, and even if we were all repeating the same action, repeating the same thing, it was still a good spirit.

At the height of fifty stories, we walked for almost an hour.

When we came to the first floor, in addition to being in a trance and our calves were weak, we also felt a sense of the aftermath of the disaster.

"Old dog, take the technical team back to the bureau for trace inspection. Zifan and Xue Hang went to investigate the identity of the deceased, as well as social relations. Xiaomeng, follow me to the property to get monitoring. ”

I gave a deep command, and then we went our separate ways to solve the case.

I took Li Meng to the property management office of Chunjian Building early and met a security guard.

"We are from the Ningzhou City Public Security Bureau, let your people in charge come, I have something to ask." I showed my ID directly to the security guard and spoke.

The security guards in this community are uniformly assigned by the security company, and they wear black imitation SWAT style police uniforms, with security guards written on their armbands and security guards on their backs.

After hearing my words, the little security guard immediately stood up and saluted me with a non-standard military salute.

"Yes!" The little security guard made a sonorous voice.

His behavior made me a little dazed for a while, but fortunately he didn't stop, turned around and left, otherwise I would really be hesitant to give him a military salute back.

After about five minutes, a security captain wearing the same costume walked into the management office.

"You two are comrade policemen, you are finally here, I heard about the murder in the building early in the morning, but I am saddened. If you can't get it, even our security guards will follow the pot to eat. The security captain complained about his grievances as he stepped forward and shook hands with us one by one.

He looked like he was in his forties, with vicissitudes written all over his face.

"I need to retrieve the elevator monitoring, fire escape monitoring, and intersection monitoring in the Chunjian building where the crime occurred." I didn't talk to him too much, I just spoke.

The security captain looked at us and swallowed hard, a look of embarrassment flashed across his face.

"Okay, you come with me." The security captain said quietly, and his confidence was obviously not as strong as before.

Seeing his reaction, I had a bad feeling in my heart.

Li Meng and I followed the security captain into an office inside, and the security captain still showed some hesitation, he sat at his desk and turned on the computer.

As soon as he pressed the power button, there was a very loud fan sound from the chassis, comparable to the sound of a walk-behind tractor.

The computer screen lit up, flashed the boot icon, and then stopped moving, and kept spinning.

Li Meng and I glanced at each other, shook our heads slightly, and continued to stare at the computer screen.

The security captain turned his head a little embarrassed and looked at us: "I'm sorry, the computer is a little stuck......"

I didn't speak, but nodded silently.

We waited for five minutes before the computer finally turned on, showing the desktop background and the icons on the screen.

The security captain clicked on the "My Computer" icon, and the computer was stuck again.

The security captain took a deep breath, clicked the mouse more than a dozen times, and finally opened it.

What caught our eyes was the red C drive, which displayed "124M available, a total of 110GB", while the other three local hard disks were basically empty.

"What's in this C drive?" I muttered helplessly.

"Huh? What did the two officers say? "The security captain turned around and asked us.

"It's okay, you can go ahead." I smiled and said lightly.

"Oh." The security captain turned around, and after another operation, he finally turned on the surveillance video.

Li Meng and I had happy expressions on our faces, and we let out a long sigh of relief.

"Turn on the surveillance video from eleven o'clock last night to five o'clock this morning." I hurriedly said.

"It is very likely that the murderer entered the rooftop in advance to take refuge, and only descended to the crime room at night, and should be called up for 24-hour full surveillance." Li Meng listened to me and hurriedly retorted.

I nodded, and what Li Meng said made a lot of sense.

I was about to change my words when we suddenly saw a pitch black computer screen with the embarrassed face of the security captain reflected on the screen.

"What is this?" I frowned and asked.

The captain of the security guard turned around with an embarrassed face, looked at us in a daze, and stopped talking.

We looked at each other for thirty seconds.

"That...... This monitoring ...... It hasn't been used since the building was built...... Possible...... Maybe it's broken......" the security captain said to us very embarrassed.

"What?! Haven't used it? Could it be broken? ”

Li Meng asked and bit the word "maybe" very hard.

"That...... I ......" the security captain was speechless for a moment, and said hesitantly.

"So, you know surveillance is bad?" I asked, a little angrily.

The security captain smiled awkwardly, avoiding our gaze and not speaking, just nodding silently.

His expression really made me a little angry, it was really a waste of our time. This building has been in use for almost a year, and the monitoring cannot be broken at this time, it must have been broken a long time ago.

"Your security matters, there will be relevant departments to deal with you." I suppressed my anger, almost gritted my teeth and left after leaving a word, and then turned around and left with Li Meng.