Jiang Jun and I were a little surprised, but I quickly put away the surprise in my heart, Lu Nan is worthy of being the king of solving cases on the same level as Shen Cheng. By this point, I already knew the line of thought of Lu Nan's reasoning. It didn't take long for Lu Nan to run back, and he didn't look at the surveillance footage, so he asked us how we were.

I nodded: "Everything, it's the same as you guessed." As I spoke, I pointed to the surveillance screen. Lu Nan glanced at the machine screen, and he laughed twice: "I have to say, some little tricks have been played by the mastermind behind the scenes, this game, he has been arranging it for a long time!" ”

Jiang Jun was not very clear about the mysterious disappearance of the corpse at that time, and he asked me what was going on with Lu Nan. Lu Nan also doesn't sell off, he said, wired surveillance video, want to use some external devices to interfere, it is almost impossible, want to interfere with the surveillance video, only through series or parallel circuits and signal circuits.

Ronan said he was in the officer's office and found a switch. The location of the switch, where it exists, is very hidden, and Lu Nan also searched for a long time before finally finding it in the corner behind a desk. The button was no different from the button of an ordinary electric light, but it was so low that it was blocked by a table, and no one could find it.

It was only after he pressed the switch that the monitoring screen suddenly became white.

"This bureau started when the surveillance cameras were installed." Lu Nan called Zhao Da.

Zhao Da still didn't know why, Lu Nan asked Zhao Da, when was the surveillance camera installed. Zhao Da thought about it and said that it was about two months before I came to G City. The economic conditions of G City are not good, let alone a few years ago, and even now, most places still do not have surveillance cameras.

There are surveillance cameras, which are some high-end residential areas, and state departments, as well as in some downtown areas. The surveillance camera in the downtown area was also installed by Zhao Da at the suggestion of the government department after the woman in red case happened again. Lu Nan asked Zhao Da to carefully recall the scene when the surveillance camera was installed.

Zhao Da thought about it for a long time, and finally had some impressions.

Zhao Da still remembers that it was a public holiday, and there were not many police on duty in the police station, and the police deliberately chose to let people install surveillance cameras at that time, so that it would not affect the work of the police. When Lu Nan heard this, he snapped his fingers: "Go and recruit the person in charge of the company that installed the surveillance camera and the direct installer, they have a problem." ”

Lu Nan analyzed that the surveillance camera was a rare thing for the G City Police Force at that time, because of the times, the police at that time did not know much about circuits at all, and they never thought that someone would dare to go to the police station to do something, so no one would care about whether the installation master really did anything.

Now it seems that the mastermind behind the scenes was when the surveillance camera was installed, and he only had the opportunity to do it at that time. Therefore, Lu Nancai said that the mastermind behind the scenes has been prepared for a long time. Zhao Da didn't doubt Lu Nan's words, and immediately sent the police to arrest someone.

This monitoring room was originally a small office, but it was later vacated as a monitoring room. Because nothing happened inside the police station, there was basically no one on duty in the monitoring room. Zhao Da only remembered that at that time, the master who installed the surveillance camera moved some equipment in, and those instruments are now also in the monitoring room.

We all looked at it, and there was only one monitoring screen, but the monitoring table was made of iron and was relatively large. Ordinary monitoring stations are like this, and we didn't suspect it at first. In the monitoring station, various wires and devices are generally installed for monitoring and normal operation.

Soon, Lunan was behind the monitoring station and found a door that could be opened and closed, but it was locked. Generally, large electronic devices will be locked at the electrical box.

Lu Nan pointed to the lock: "Give me the key." ”

Unexpectedly, Zhao Da said: "We don't have the key." The installation master said that if there is a problem, look for him again, and don't touch the circuit inside if you are usually fine. ”

Lu Nan was a little crying and laughing: "I really don't know if you are stupid in this police force, even if you don't know how to repair the circuit, you should leave a key, the monitoring station was purchased by you, and the ownership belongs to you, you didn't even leave the key?" ”

Zhao Da's face was red when he was ridiculed by Lu Nan, and Zhao Da hadn't figured out what was going on, he hesitated, saying that when the installation master was arrested, he would have the key. However, we couldn't wait that long, Lu Nan directly found an iron hammer and began to knock on the lock on it, and at the same time, the iron sheet of the monitoring table was also knocked into it.

Soon, the lock was smashed open. When Zhao reached this time, he still looked distressed. However, when Lu Nan opened the iron door, Zhao Da was stunned. I sighed and laughed a little self-deprecatingly: "I see, that's what happened. ”

In that door, there were indeed all kinds of intertwined wires, but they were all stuck to the edge of the iron sheet by footsteps, and in the middle of the electrical box of the monitoring station, there was also a power supply box, Lu Nan turned it on, and the cold air came out all of a sudden.

This turned out to be a low-temperature refrigerator, and I recognized it at a glance, and this thing, and the refrigerator used by the identification center to park the corpse, were the same thing.

"Now you understand what's going on, right?" Lu Nan asked us: "Whether it is the disappearance of the corpse or the return of the corpse, the time is very short, the corpse can only be hidden inside the police station, all of you are not familiar with the surveillance, if it is not a problem, you will not find the secret in this monitoring station, and if there is a problem, you may also find someone else to fix it." By the time you find out what the problem is, you won't know that the Year of the Monkey has passed, a bunch of idiots! ”

Through the surveillance footage, Lu Nan deduced that there was circuit interference, and thus deduced that there was a problem with the person who installed the surveillance camera in the first place.

Based on the disappearance and return of the body, he speculated that the body had been inside the police station all along. The few days after the corpse disappeared and did not decompose, Lu Nan speculated that the corpse was hidden in a place where it could be kept cold, and on such a hot day, the only way to keep it low was through electricity.

In the end, Lu Nan deduced that there was something wrong with this monitoring station.

When all the mysteries are solved, the mysteries are no longer mysteries, they are no longer weird, and they are even a little funny. This is also the reason why Lu Nan said that the mastermind behind the scenes can play some small tricks superbly.

"When the body disappears, everyone is resting, as long as one person attracts everyone's attention, so that everyone does not know that the other person is going out, and at the same time press the button that interferes with the monitoring screen, the monitoring screen has no way to record his traces. He went to get the corpse, quickly moved it here, used the key he had, opened the monitoring table, stuffed it in, and then went back as if nothing had happened, without knowing it. Lunan said.

Everyone, including me, was completely impressed by Lu Nan's reconnaissance.

"When the corpse returns, it's the same thing, first turn off the surveillance camera, and then act, after the incident, turn on the surveillance camera, the effect, perfect, so that everyone can't explain it, make everyone afraid, and then some people use public opinion to make everyone more afraid, which will make people ignore the strange event itself." Lunan said.

Once, I was very close to the truth, but I didn't think about it. Now that I think about it, at the beginning, I entered this monitoring room several times, and I still felt that the temperature in this monitoring room was much higher than other places. At the time, I thought it was the heat emitted by the normal operation of the monitoring station, and the weather was already hot, so I ignored it.

It turned out that the heat was generated by the long-term operation of this machine that can keep the temperature low.

I've come to understand it thoroughly, and maybe that's why there are more than one ghost in the police station. Because all of this is difficult to accomplish by one person alone.

One inner ghost is Xiao Gang, what I want to know is, who is the other inner ghost. Lu Nan told me that he had already guessed it after watching the video before the corpse returned, and I was slightly stunned because I had also guessed.

At this time, the people sent out by Zhao Da to arrest were brought back.