Tang Yuyan smiled and said, "Okay, okay, my Lion Warrior, let's have a small meeting!"

I took Tang Yuyan and Wei Jin to the second floor living room of this villa, sat down together, and said, "I found some clues."

Tang Yuyan said, "So too."

I said, "Ladies first!"

Tang Yuyan said: "I used the glass slag to simulate the puzzle and found that an external long strip of glass is consistent with the molecular sequence of the window glass. It can be shot out through a crossbow and smashed the glass window."

I nodded and said, "The murderer is very particular, and he still uses a continuous crossbow."

Tang Yuyan said: "The molecular sequence of this broken glass is different from the glass in other windows, and the hardness is lower, which means that it has been replaced by the murderer in advance in order to make it easier to be broken."

I said, "My sister is amazing!"

Tang Yuyan blinked at me and said, "It's up to you, my brother."

I said, "The murderer used the same mop to carefully wipe the floor and the operating table and wiped off his footprints. As for why he knew it was the same mop, it was because..."

After telling the story of the unlucky American drivers and police officers to Tang Yuyan and Wei Jin, letting them understand what matter exchange is, I continued: "The same fiber residue left behind both the operating table and the ground, which is often used on mops."

Wei Jin said at this time: "The discoveries of Wei Ce and Yu Yan can prove that this was done by humans, but why can the murderer come without a trace?"

Tang Yuyan and I looked at each other and laughed, and said, "Ceil!"

The three of us (ghosts) simultaneously activated our mana to detect above the ceiling of the kitchen. Good guy, a fully automatic telescopic and open-cover shooting crossbow machine hidden inside.

The mission is completed, go home!

After lunch at the law firm the next day at noon, I called Luo Chao and said, "What are you doing, buddy?"

Luo Chao sighed there and said, "Oh, I'm watching the second time the villa area video recording. Just when you call, I'll come out to get some breath and take a cigarette."

I said, "I went back last night and thought about it. Are you sure you have searched the villa for a round?"

Luo Chao said: "It's certain that if this villa hadn't been made of expensive decoration materials, I would have liked to lift up all the floor tiles."

I said, "Where is that ceiling?"

Luo Chao said, "It's the same thing. It's the first time I've seen a marble ceiling. I don't dare to tear it down."

I said, “Is it difficult to borrow a portable x-ray machine?”

"Dududu!"

I shook my head and called Tang Yuyan, intending to have a remote call with her.

"Lingling!!"

In the evening of that day, Tang Yuyan and I were walking on the beach near home holding hands, and my phone rang. After the call was connected, Luo Chao's excited voice came: "Damn it, dazzle!"

I shook my head and said, "Young man, be at ease, say less swear!"

Luo Chao said: "You kid is so awesome. As soon as you mention it, I immediately borrowed a portable X-ray machine from the prospecting bureau and planned to have a major physical examination of the floor, wall and ceiling of the villa. As a result, I just finished the kitchen on the first floor and found the weapon!"

I said, "Oh? What kind of weapon is hidden where?"

Luo Chao said: "Just above the ceiling, it is a very fine fully automatic telescopic crossbow machine that can fire two crossbow arrows."

I said, "You mean the murderer is hiding inside the ceiling and then hung upside down like a bat to shoot out the window?"

Luo Chao said: "How is that possible! I said it's automatic expansion and contraction."

I said, "How to stretch?"

Luo Chao said: "The murderer should be a man who understands mechanical principles very well. He cut a rectangular opening into the ceiling of the marble ceiling, and then used a robotic arm to open the square marble thin plate downward like a door, and the crossbow can be exposed downward through the telescopic rod to aim out the window. Moreover, the cut is very thin and thin, and it cannot be seen without careful observation."

I said, "How to aim?"

Luo Chao said: "The angle of the crossbow machine cannot be adjusted, and it is shot by fixed angles in advance."

I said, "That means the murderer must be nearby at that time. He saw the deceased passing by a certain location and fired a crossbow."

Luo Chao said, "Damn you, it would be great if you were my partner! Several of my team members didn't expect this."

I said, "How do you open and fire the crossbow?"

Luo Chao said: "With a mobile phone, when the mobile phone is dialed, the motor responsible for vibration inside the mobile phone will pull a wire, start the robotic arm and open the marble slab, sink the crossbow, pull the trigger in one go."

I said, "And the number of this mobile phone is not real-name, the mobile phone is also second-hand, right?"

Luo Chao said: "Yes, yes!"

I said, "But now there are so many harassing numbers. If this number is called by others, wouldn't such a precise device be wasted?"

Luo Chao said: "The ringtone mode was set in advance. If a strange number is called in, or if a text message is received, it will be silent and will not vibrate. If a specific number is called in, it will be vibrated."

I said, "Then is the power supply connected to household electricity?"

Luo Chao said: "Yes, I asked the homeowner. They can be sure that they pulled the switch when they left two years ago, but when we came to investigate, we found that the switch was closed."

I said, "The murderer had to arrange this device at least three months in advance, with the purpose of waiting for the storage period of the surrounding cameras to pass!"

The computer hard disk storage volume behind the camera is limited, so the storage period of public cameras, such as Skynet systems, is generally three months. Some private camera systems are shorter than this, so they keep cycling.

Luo Chao said: "It may not be over yet. We are seeking help from the technical investigation department to see if we can restore the content covered by the camera storage medium, and extend the shooting time more forward and the shooting time more."

I said: "This requires external factors such as the quality of the hard drive, but no matter what, it is good to be able to recover to half a year because it is repeated rewritten coverage. The murderer must know this. I think this idea is not good, but you like to use this kind of human-season tactic the most. It is not harmful to spend a few more days to watch the video forward."

Luo Chao said: "Don't you have a good opinion on the human sea tactics, what should I do next?"

I said, "Of course, it is to start with the crossbow device to find the purchase channels, or the human wave tactic."

Luo Chao said: "Bah, how many successful cases have been solved have been found through basic work such as basic investigations, visits and watching videos. Don't underestimate the so-called human-sea tactics in your eyes."
Chapter completed!