"Luminol, also called luminol, is a synthetic organic compound with a certain pungent taste. Luminol reagent is a mixed reagent of luminol and hydrogen peroxide, which can react with the iron contained in hemoglobin in the blood.

, releasing blue-purple fluorescence. When forensic investigators investigate a murder scene, if the scene has been wiped and processed, the luminol reagent can detect traces of blood that cannot be observed with the naked eye through this luminescent reaction." Xu Zhenguo picked up his mobile phone and explained.

"You mean there was a murder in the house?"

"My idea is to rule out this extreme possibility, but even if the reagent does not react, it does not prove that no vicious injurious behavior occurred in the room."

"But how did you explain the reaction principle of luminol reagent so clearly?" He Li asked curiously.

Xu Zhenguo showed the Internet interface of his mobile phone to He Li and joked: "Five minutes on Baidu and one hour on Baidu. I'm not like you who can only open your mouth and ask questions. I'm a modern person who can use my mobile phone to surf the Internet."

Zhou Quan opened the door of Room 902, took off his mask, and symbolically fanned the wind with his hands beside his face: "Brother Xu, originally this reagent has been diluted and has no smell, but I can do it as you asked, and it will be all over the room."

It smells so bad that it makes my head hurt."

Xu Zhenguo asked: "What is the effect?"

"Come in and I'll tell you."

Xu Zhenguo put out his cigarette butts and followed Zhou Quan. He Li also followed silently.

Zhou Quan opened the door and said, "Brother Xu, I bought this reagent myself. Remember to reimburse me."

"Okay, okay, you have the final say."

After He Li entered the room, he found that all the windows in the house were sealed with dark tape, and the weak light outside the room could hardly penetrate into the room through the tape.

The figures of Zhou Quan and Xu Zhenguo squatted on the ground one after another.

"I used a nozzle to spray the reagent in every corner of the room, including the key parts you mentioned. I don't know if I'm glad or regretful, but the result is that there was no reaction anywhere." Zhou Quan squatted on the ground and pointed at the room.

every corner of.

"There are no drains in the bathroom or kitchen, right?"

Zhou Quan shook his head: "Indeed, none."

Xu Zhenguo replied lightly: "I know."

He Li couldn't help but wonder: "Does that mean there was no murder in this room? But why go to such trouble to create a secret room?"

Xu Zhenguo did not answer, but walked to the window and slowly tore off the tape: "On the night of Friday, July 2nd, I already know what happened after Li Lianbo and Zhang Yunhao entered the house, but there are still some problems that I might have expected.

There are some discrepancies. As long as the remaining questions are solved, the mystery of the secret room will be solved."

Xu Zhenguo said as he opened the suitcase and took out a shabby bed sheet.

He Li pointed to the sheets and asked, "Old Xu, do you want to do another experiment?"

"I originally had this plan, but now it is no longer necessary."

"Why?"

"Because of the rope problem."

"What rope?"

He Li walked to the window sill in the living room and leaned out slightly like Xu Zhenguo did.

He observed it for a few minutes, then turned around and said, "I understand what you mean by 'rope'! Li Lianbo and Zhang Yunhao may have used ropes to descend to the first floor, right?"

Xu Zhenguo was noncommittal.

"But why don't you do the experiment? I think it should be feasible to escape from this room using a rope?"

Xu Zhenguo continued to be calm and did not answer.

"The bed sheet in your hand... you mean that the rope they used to escape was made of bed sheets, right? But if there is such an escape rope, why does it have to be made of bed sheets?"

Xu Zhenguo then said slowly: "He Li, your ideas are still in the initial stage of reasoning. Most of the time, you take things for granted. I can tell you directly that it is impossible for Li Lianbo and Zhang Yunhao to escape through the window.

For this room.”

"Why isn't it possible?"

"First of all, let me explain the problem with the bed sheet." Xu Zhenguo handed a corner of the bed sheet to Zhou Quan, "Xiao Zhou, look at it, is the material of this bed sheet very similar to the fabric inspection material you picked up near the water pipe yesterday?"

Zhou Quan took the sheets and looked at them carefully for a while, then nodded and asked: "It does look the same. But Brother Xu, how did you guess it? I haven't found the result yet!"

"Because I am older than you, have more experience and have more common sense of life." Xu Zhenguo replied with a smile, "When you said that the extracted fibers were blended fabrics, I noticed that they might be cotton and linen fabric fibers.

.And this kind of textile material is usually used in curtains, bedding and other daily fabrics.”

While Xu Zhenguo was explaining, He Li took the bed sheet from Zhou Quan's hand and said: "Who said my reasoning is only in the preliminary stage? I will tell you two now how they escaped from the room!"

He Li walked to the water pipes in the kitchen and asked: "Zhou Quan, I remember that you extracted the fabric fiber materials near the water pipes. The kitchen window is the closest to the water pipes in a straight line, and there are no walls blocking it.

.So this is the best place to escape from the room.”

Zhou Quan rolled his eyes and He Li did not answer. Xu Zhenguo gestured to He Li to continue: "How did Li Lianbo and Zhang Yunhao use the sheets to escape from the kitchen window?"

He Li said without thinking: "The easiest way is... if you cut the sheets long enough, fix one end of the rope on the water pipe, and hang the other end to the second floor, then you can swing slowly along the rope.

Go to the first floor.”

Xu Zhenguo did not refute, but continued to ask: "Is there any other way?"

"The two of them can also climb into Room 802 and Room 1002 with the help of ropes, but the premise is that there must be a third person present in these two rooms to open the window and help them escape from Room 902..."

"It's almost done." Xu Zhenguo interrupted He Li's self-narration, "You have already thought of many methods in your mind. Of course, these methods are not feasible and are very naive. First, no matter which of the above methods is used, theoretically

Nothing can be accomplished by one person, and another person is needed to deal with the aftermath. For example, after Li Lianbo and Zhang Yunhao escaped from the window, a third person always had to deal with the rope tied to the water pipe and the open window.

Drop it?"

"Isn't there Qu Yanan?" Zhou Quan said with her clear voice, "She entered the room on Saturday morning, took back the rope and put it in her bag, then closed the window, and then lied that the window was always closed and the secret room was

Isn’t it already formed?”

Xu Zhenguo nodded: "If something suspicious did happen in the room, Qu Yanan is indeed a suspect. But the next thing I want to say is the second point. Use the rope from the ninth floor to the first floor.

It’s a fantastic thing, and it’s simply impossible to do.”

"Why?" He Li and Zhou Quan asked in unison.

"As high as the ninth floor, professional firefighters need to practice repeatedly and take adequate protective measures before they can descend. It is impossible for ordinary people to complete such a difficult challenge, both psychologically and physically. In addition, because of the bed sheets

It is made of cotton and linen, and it is not strong enough to be stretched. In addition, every section of sheet must be knotted, so the safety cannot be guaranteed. If you insist on doing this, it is tantamount to committing suicide."

Xu Zhenguo walked to the window and said: "The third point is also the most important. Regardless of whether the method of using the rope is feasible or not, the existing evidence may prove that the two of them may have had this idea, but in fact the two of them did not

It has never been done.”

"Where is the evidence you mentioned?" He Li asked.
Chapter completed!