As a local policeman, is it appropriate for you to take over the job of a criminal policeman?

"The technical department focused on checking Mao Xiaolin's room and the small courtyard behind it. Fingerprints of Mao Xiaolin and his family were found in the room, as well as some unknown fingerprints. In general, there were a lot of fingerprints. They also asked Mao Xiaolin's grandfather. Because the family runs a chess and card room, sometimes people walk in by mistake, so fingerprints are not very useful for reference."

"The footprints were similar. We found obvious signs of cleaning on the ground. Now Wu Xiuhua couldn't tell whether she cleaned it or the murderer did it."

Zhao Jianfeng interrupted, "Captain Ye, I think it's more likely that the murderer has cleaned the place. Since they've already set up a secret room, they must have considered everything carefully."

"That's true. It feels like the murderer this time is more sophisticated." Wang Longxin also echoed.

"Let's read the report first. It may be just a simple trick to deceive people. It will soon be the secret room you are concerned about."

Yu Haifeng said this and continued reading the report.

"Since the room was locked at the time of the crime, the technical department conducted a detailed inspection of the two locks."

"The door lock was damaged except for the fact that it was hit. There were no signs of modification on the window latch. There were no fingerprints on either place. It is very likely that someone had cleaned it. As for how the secret room was formed, the technical department does not know either."

"Damn, after talking for so long they still don't understand." Wang Longxin complained.

"He's in the technical department, not a detective." Yu Haifeng rolled his eyes at him.

But there's really nothing in this report.

"What about the yard at the back?" Ye Lin suddenly interrupted.

"Oh, there is also a report in the yard." Yu Haifeng took out the report and continued.

"The yard is a hardened ground, and there are no obvious footprints on the ground. However, Mao Xiaolin's windowsill is strangely free of dust, which doesn't seem like the kind of dust that would be found if he stayed outdoors all year round."

"It's possible that the murderer had cleaned it before."

"Has the technical department of the courtyard wall checked it?" Ye Lin continued to ask, his pen constantly drawing on the paper, and the appearance of a courtyard came to life on the paper.

"Yes, the wall of the yard is not high, less than 2 meters, and there is no protection on it. It is just a simple slope to leak water. There is moss on most of the wall, but on the left side, there is an area about 1 meter long, and the moss has been cleared."

While Yu Haifeng was reading, Ye Lin was drawing on the paper with a brush.

The courtyard wall on the left is a dead corner of the community, and not many people go there.

"That's basically all the information about the technical department. Do you have anything to say?" Yu Haifeng closed the report and looked at everyone.

In general, the report from the technical department is very comprehensive, but there is really not much useful content.

"After talking for so long, I still have no idea about the secret room." Sister Qi Shan was a little disappointed. Secret rooms are a very popular topic among young people of her generation. There are even games called escape rooms.

She had always wanted to know where the secret lay, but she didn't expect that the technical department couldn't do anything about it.

"Don't just focus on the secret room, we have to use our conventional methods as well. Didn't I ask you to divide the work before? Tell me the results one by one." Yu Haifeng frowned. These people only knew how to gossip and didn't report anything that they had told him to do in the morning.

The leader put on a brave face and everyone quieted down.

"Let me start by saying that I checked the surrounding surveillance cameras. There is no surveillance camera at the main entrance of the chess and card room. I also asked Mao Renfeng, and he said that they deliberately did not install it because they were afraid that someone would use the surveillance camera to make trouble." Zhao Jianfeng spoke first.

Everyone was speechless. Well, they probably didn't want the police to find out about their gambling. But now, there wasn't even any surveillance, so they didn't know who came in and out.

"What about the surrounding areas?" Yu Haifeng shook his head and asked.

"There are surveillance cameras in the residential area all around, and they are all on the main roads. There are several roads leading to their chess and card room. I looked and it is easy to avoid the surveillance." Lao Zhao answered affirmatively.

Old Zhao wanted to say something, but Ye Lin suddenly stood up and interrupted, "Are there any surveillance cameras behind the yard?"

"The yard?" Zhao Jianfeng lowered his head and searched through the notebook. "No, it's over there, near the wall. It's not there."

Ye Lin nodded and sat down.

"Linzi, do you think it's in the yard?" Yu Haifeng asked.

"There are so many people at the gate. Most people would definitely walk through the courtyard. There's no one there. But there is a courtyard wall."

Since he was speaking, Ye Lin continued, "There is another question. We know that Mao Xiaolin is 13 years old and weighs about 170 pounds, which is about the same as an adult. How did the murderer get him out?"

"At least if I were asked to carry a 170-pound person on my back and climb the wall, I wouldn't be able to do it."

How can a 2-pound person get out of a wall less than 170 meters high?

"Then knock him out and carry him out?" Sun Jinghua said.

"Come, lie down and let Xiao Wang and Lao Zhao lift you up." Ye Lin pointed at Sun Jinghua and said.

Sun Jinghua is small in stature and weighs only about 150 pounds.

Lao Zhao and Wang Longxin tried it, and found that it was no problem for two people to carry it, one in front and one behind, and they could walk, but it was basically impossible to climb up the wall.

Ye Lin also tried it. With the help of the system, he picked up Sun Jinghua with one hand, which scared everyone.

But even with his strength, it is difficult to get people out of the wall.

"Captain Yu, I think we need to consider several issues." Ye Lin stood up and spoke.

"You say, we remember, hurry up, remember it well." Yu Haifeng scolded exaggeratedly.

Now the main responsibility of solving the case lies with Ye Lin. There is no other way, this guy is too evil.

"First, was the person taken away from the house?" Ye Lin said loudly.

"Is there any problem with this?" Old Zhao asked puzzledly.

"From what we can see so far, there is no surveillance when we leave the door. It's all people playing cards. If they happen to be quite excited, maybe we won't even know that Mao Xiaolin has walked out."

"That's right." Old Zhao echoed.

"Secondly, if they were taken from the house, leaving aside the secret room, how could they get a person the size of an adult out quietly?"

"Knock him out and carry him away? Or tie him up and use a crane to lift him away?"

"If you go from the front, you'll see people playing cards; if you go from the back, you'll see a wall. Neither works."

"Third, why do you want to get rid of the person? If it's purely revenge, for example, if you want to kill someone, the murderer's secret room is enough. You can just kill the person and build a secret room. Why bother with this?"

Everyone was a little confused by Ye Lin's speech. Even those who originally understood a little bit became confused. Why did this case feel so complicated?

"Captain Ye, I feel like you are talking like a leader, with the numbers one, two, three and so on." Wang Longxin complained.