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Sure enough, under Jiang Yunshan's reminder, Xiao Yong also discovered a small amount of dust on the right corner of the tea table, compared to the rest of the table.

Xiao Yong stuck out his bottom and brought his face closer to that place. Then he began to describe to Jiang Yunshan:

"Boss, I estimated with my eyes that this small area is about the size of a diary. If this kind of strange phenomenon wasn't caused by the environment of the room, then it can only be explained this way. After we left, someone came back and placed something here, then that thing took away the ashes on it."

"No problem with what you said." Jiang Yunshan nodded his head, and said: "But it seems very strange, it has already been a month since Cheng Guodong was killed, and in this one month of time, we have sent people to guard the surroundings of the room for twenty days, but no one has notified anyone that they have entered this room."

Chiang Xue asked curiously: "Captain Jiang, could it be that it was only after the people left that that person came in?"

Xiao Yong also nodded from the side, and muttered: "Yeah."

"Didn't you notice another problem?" Jiang Yunshan squatted and said: "Strictly speaking, these should be two layers of ash. The layer of dust at the very top should be about one millimeter, but the layer of dust below, if it was not as layer of ash, then it would be too little, and that can only mean one thing, and that is, the thing in the corner must have been placed here by someone a long time ago, if it was placed here by someone recently, then the layer of ash below would not be as much, nor too intact!"

"Boss, do you mean that someone has escaped our sight and entered this room?"

Xiao Yong could not help but be shocked, this was not his fault, because the ones in charge of monitoring the surroundings were him and the Shan Zhan who had already left. If Jiang Yunshan's deduction was correct, then to him and Shan Zhan, this would be equivalent to dereliction of duty.

"What's the matter with you?"

Chiang Xue saw that Xiao Yong was in a daze and pushed him with his shoulder out of curiosity.

"No …." "Nothing!" Xiao Yong shook his head in embarrassment and asked: "Leader, I am not trying to excuse myself. I have been staying here with Brother Zhan these past few days, but I did not discover any strangers entering this room.

"I trust you and Shan Zhan, but that's the way it is."

Jiang Yunshan looked at Chiang Xue who was beside him, but did not explain himself, and said: "Forget it, since it has already happened, there must be a reason behind it. I think we should first investigate it from the inside of the house, and see if there's anything that we missed out."

"Then I'll go to the study."

She was a smart woman, and knew that Jiang Yunshan had some things that he did not want her to hear, so she simply left their line of sight.

After Chiang Xue entered the bedroom, Jiang Yunshan called Xiao Yong to the other bedroom and said: "Xiao Yong, this matter is becoming more serious now, why don't you recall something strange happening while you and Shan Zhan were watching here for the past few days? For example, what phone calls did you receive, or did Shan Zhan leave alone?! "

"Nope." Xiao Yong took out his own phone, shook his head and said: "There's really no leader, Brother Zhan is fine too, we're both watching it together, I really didn't see anyone enter this room."

Seeing Xiao Yong's depressed look, Jiang Yunshan reached out and patted his shoulder, explaining: "Don't worry, you and Shan Zhan have been together for almost five or six years already. I'm not suspecting you guys, I'm only reminding you guys to see if you've missed anything."

He continued, "You also know, whether it's from the way of killing or the way of escaping from the scene, it's not hard to tell that our opponent is an extremely intelligent and meticulous top criminal. If you can guarantee that you've never seen anyone enter or leave the room, then you can think about it another way, it's true that someone has entered this room, but the way they entered is just like using a Powered Paraglider to reach the top, he didn't use any common sense."

"Boss, you mean that person didn't come in through the door?"

Xiao Yong's face was filled with shock: "Holy shit, this is the twelfth floor, could it be that he jumped in through a window?"

"It's not impossible." Jiang Yunshan said helplessly: "He can even think of using a Powered Paraglider to fly over and kill people, what can't he think of? Let's go, let's check the windows first. If we can't do it, then call the trace group over to reinvestigate the scene. "

"Looks like that's the only way."

Xiao Yong shook his head helplessly, and then walked out of the bedroom.

Just then, Chiang Xue also walked out from another room, a white slip of paper appeared in her hands, and she said to the rest:

"Captain Jiang, take a look at this note and see if there is anything suspicious?"

Jiang Yunshan took the slip of paper. It was torn apart by someone, and it was extremely incomplete. There were a few numbers on it, making it look like a receipt for money in a supermarket.

Jiang Yunshan asked curiously: "Where did you pick up this paper slip?"

"On the floor of the study room."

With that, Chiang Xue led the two of them to the study room, and extended her hand out to point at the ground beneath the row of bookshelves, and said: "At that time, this paper was placed on the floor, and the reason why I had problems with it was because there was also a pile of dust underneath the paper, which could only mean that this paper had fallen onto the floor at the end, if not, when I picked it up, there would not be any dust on the floor, since this study room has no open windows."

"Your analysis is very thorough." Jiang Yunshan put the slip of paper into the evidence belt and said: "Tomorrow, go to the nearby supermarket to investigate and see if you can find out which supermarket this ticket came from. If you really can find any clues, then go along with the search and see if you can find this person."

"Boss, I understand."

Xiao Yong said as he received the slip of paper from Jiang Yunshan.

Just then, he suddenly realised that Chiang Xue had moved a chair over from who knows where and placed it in front of the row of bookshelves, intending to climb up.

"Chiang Xue, what are you doing?" Xiao Yong immediately shouted, and reminded his, "Be careful, don't fall down."

After saying that, Xiao Yong walked to Chiang Xue's side, intending to reach out and support her. However, Chiang Xue's impression of him was extremely bad, so the woman immediately gave him a fright, saying that there was no need, then stuck her head into the bookshelf.

Jiang Yunshan asked: "Chiang Xue, did you find anything new?"

Through her interactions with Chiang Xue during this period of time, he realised that this woman was not simple at all. Although she appeared to be as sweet and silly in front of them, from the moment she entered this room, she had already grasped the majority of initiatives.

To be honest, putting aside Chiang Xue's somewhat snobbish character, Jiang Yunshan quite liked the twenty-five year old lady in front of him. She felt that for a smart girl like Chiang Xue, it would be a waste of her talent to stay in the police station. The Police Force punishment was the best place for her to display her talent.

Of course, as for his feelings, Jiang Yunshan still didn't want Wang Xiaochuan to be with her. This woman was simply too smart, might not even know when he would sell him out!

Just then, Chiang Xue hesitated, and said in shock: "Captain Jiang, there's actually a secret compartment in this bookshelf!"

"A secret compartment?" Xiao Yong asked curiously: "Is there something inside?"

Jiang Yunshan also asked at the same time, and had his eyes fixed on Chiang Xue's every move, afraid that this woman would hide the evidence behind her back and do something.

"What a pity." Chiang Xue helplessly spread out her hands, "There is nothing inside, and Captain Jiang, I discovered that the locks in this secret compartment had already been touched by someone, that is, opened. It seems to be done by that person."

After saying that, Chiang Xue curiously placed her finger on the corner of her mouth, and adorably muttered: "What exactly is inside that thing? Judging from the size of this secret compartment, it should not be able to hold any notebooks or anything like that. In my opinion, if it's not a bank card or a passbook, it should be a photo or something like that. "

"Come down, I'll go take a look."

Jiang Yunshan waved curiously at Chiang Xue, and stood on the chair.

To be honest, Jiang Yunshan had some admiration for his subtle insight now, he felt a little ashamed. Last time, when he was investigating this room, he had looked at this place before, but because Wang Xiaochuan had coincidentally been expelled from the police force, he became agitated and angry, so he missed out on this important discovery.

"Sigh, I was really careless. If I had discovered this secret compartment, this case might have been solved long ago."

Jiang Yunshan sighed helplessly, and turned to Xiao Yong: "Tomorrow, when you have time, come with me to see Cheng's wife, and ask her if she knows what is hidden in this secret compartment!"

"No problem, boss."

Xiao Yong turned his head in front of a window and replied. At this moment, he was carefully inspecting the connecting point of the window, wanting to see if there were any traces of people opening the window from the outside. Unfortunately, besides a layer of dust on the window, he did not find any other valuable clues …