I am Detective Wu Nan

"Old Sun, what are you doing? You scared the child!"Zhao Chenggong couldn't help but become stern.

""Okay, okay, you guys talk, you guys talk, you guys listen to a nine-year-old kid teaching you, I'm leaving!" Sun Meng finished speaking, pointed at Wu Xinyan fiercely with his fingers a few times, with a strong sense of warning, and then turned around and walked out.

Sun Meng is an old criminal policeman, about the same age as Zhao Chenggong. Although his position is not as good as Zhao Chenggong, everyone knows his temper!

""Wait a minute!" Wu Nan shouted.

At the same time, he jumped over the sofa, trotted past the others, quickly jumped to the door, blocked Sun Meng's way, and shouted:"Don't go!"

""Xiao Nan, what are you doing?" Wu Xinyan yelled.

Female criminal police officers were discriminated against in the first place. Wu Xinyan was able to be transferred here with the help of her uncle. She was criticized a lot in the bureau, and everyone said she was a vase!

Now it happened again, her brother quarreled with his own leader!

Wu Xinyan was almost crying!

"Hey, hey, hey, I'm telling you! You can't leave!" Wu Nan pointed at Sun Meng with a fierce look on his face.

"What do you mean?" Sun Meng looked at Wu Nan, then at Wu Xinyan.

"It's your business whether you listen to me or not, but you broke my vase, so you have to pay me for it!" Wu Nan said confidently.

"Xiaonan, stop making trouble.……"

"Sister, don't worry about it.……"

Sun Meng was so angry that he was about to lose his temper!

"Let me tell you, I am nine years old and I am in primary school. If you dare to touch me, I will lie on the ground and not get up. I will also post on Weibo and let the whole country know about you... Police beat children... You will be dismissed immediately.……"Wu Nan spoke very fast and his logic was very clear!

Sun Meng's face turned purple with anger.

What to do?

He really didn't dare to hit Wu Nan! If Wu Nan was twenty years old, he would have slapped him!

But Wu Nan was only nine years old!

""Okay, okay, Comrade Wu Xinyan, I've seen something new. Your family is really powerful. This is your important clue!" Sun Meng spoke very quickly, and his voice was a little trembling, which showed how excited he was. While speaking, he opened his briefcase and took out fifty yuan from it.

Bang!

Sun Meng slapped the fifty yuan on the cabinet next to him and yelled at Wu Nan:"Is that enough?!"

"Old Sun, don't scare the child!"Zhao Chenglong said again

"Enough!" Wu Nan tiptoed and stretched out his hand, took away fifty yuan, then stepped aside, walked past Sun Meng, and said to Zhao Chenglong:"Uncle, are you leaving too?"

Wu Nan walked behind the coffee table, sat on the sofa, and said:"If you don't leave, I can tell you who the murderer is... It's Wang Shengli, the resident of 501 downstairs!"

Zhao Chenglong was looking at Wu Xinyan and was about to say something.

Hearing Wu Nan's words, he turned around and looked at Wu Nan!

Sun Meng had already walked out the door and stopped.

"Xiaonan, don't talk nonsense."Wu Xinyan immediately said, Wu Nan's previous deductions can only be called suspects, murderer is a qualitative term, can not be said directly!

Zhao Chenglong raised his hand to suppress, signaling Wu Xinyan not to speak, and then walked towards Wu Nan.

"Xiaonan, how do you know who the murderer is? What did you see that day?"Zhao Chenglong sat next to Wu Nan.

Wu Xinyan also walked over immediately and stared at Wu Nan, afraid that Wu Nan would say something nonsense.

Sun Meng, who had already walked out, walked back and stood at the door without saying a word, listening!

The other two young comrades also stood near the door

"I said, aren't you leaving?" Wu Nan turned his head and glanced at Sun Meng.

Bang!

Wu Xinyan hit Wu Nan on the back of the head and scolded:"You naughty child, tell me!"

Helpless!

"Okay, okay, sister, give me your bag.……"Wu Nan waved his hand.

Wu Xinyan handed the bag to Wu Nan.

Wu Nan took out the files, separated them into several parts, and laid them flat on the coffee table. Wu Xinyan thought these files were messy before... but they were not. Wu Nan had sorted them out himself, and the important ones were all on top!

"Can you please stop interrupting me when I'm talking?"Wu Nan said

""Yes, go ahead!" Zhao Chenglong said with a smile. He knew how to coax a child. He also had a daughter of the same age as Wu Nan.

"First, the scream!"Wu Nan began to say,"Women's screams are indeed around 70 decibels. In fact, men's screams are about the same. As long as you can pinch your throat and scream, why are women's screams more piercing? Because the frequency is higher.……"

"Actually, this is nonsense. What I want to say is that my sister has said before that it is impossible to hear screams on the first floor!"

"You may be skeptical about this, but I think it is certain... The first floor cannot hear it, but why can it hear it? Because the sound is not coming from room 602, but from the corridor on the sixth floor!"

"Only in the corridor, if such a scream is made, can it be heard on the first floor, because the corridor is an integrated space! The sound can spread throughout the whole building!"

"Then a new question arises. How could Zhang Xia scream in the corridor when she died in the living room of Room 602? This is the key point. The scream did not come from Zhang Xia, but from the murderer! However, this does not mean that the murderer is a woman.……"

"The murderer may be a man, and the scream may be a recording, a network audio. The most convenient way is to download it on your mobile phone and play the audio.……"

"A new question arises: if the murderer used the device to scream in the corridor on the sixth floor, how did he escape afterwards?"

"According to my reasoning, he didn't run at all! Because he was probably one of the first neighbors to arrive at the scene! So, based on this inference, the murderer lived on the seventh floor and the fifth floor. If the murderer lived on the fourth floor, he screamed and ran back to the fourth floor... He might have been seen by the neighbors who just went out on the fifth floor, but looking at the records of these neighbors, there was no such situation.……"

"After reasoning to this point, we can basically pinpoint the murderer to these four households!"

"According to the transcripts, the first people to arrive at the door of the scene were Uncle Wang from the fifth floor and Aunt Li from the seventh floor... This can prove my guess above... If the murderer came from the fourth floor, he would definitely be noticed if he ran downstairs. If he really ran fast, the noise in the corridor would be very loud... But no one heard the sound of someone running fast in the corridor.……"

"Therefore, it means that the murderer did not leave quickly after making the scream in the corridor, which means that the murderer was one of the first people to arrive at the door of the scene...a resident on the seventh floor, or the fifth floor!!"

"There are two families on the seventh floor. They are all elderly people. Their children come to visit occasionally. Usually they are just an elderly couple. The possibility of committing a crime is very low."

"On the fifth floor, Uncle Wang and Uncle Sun's families, Uncle Wang came out first……"

"Let’s look again. Uncle Sun’s family of three is harmonious. Uncle Wang lives alone and has been single for many years… In this case, Aunt Zhang Xia did not have any grudges with anyone and did not lose any property. In other words, the possibility of impulse killing is very high, which also includes… killing due to love!"

"Look at the transcripts again! These transcripts can prove that Uncle Wang was the first to arrive at the scene, and it was Uncle Wang who guessed that Aunt Zhang was in trouble. It was also him who kicked the door open and walked a few steps inside... And I think that the person who has a major suspect in the crime is also him, Uncle Wang downstairs, Wang Shengli!"

""Let me recount the circumstances of the incident!" Wu Nan paused here, picked up the water cup and took a sip of water, then continued:"Around 8:50 p.m. on July 13, Wang Shengli was discussing something in Zhang Xia's room. Because of some conflicts, Wang Shengli lost control, picked up the fruit knife on the coffee table in the living room, and stabbed Zhang Xia twice in front of him. The last knife slashed Zhang Xia's neck.……"

"Zhang Xia did not die immediately, but struggled on the ground. Wang Shengli wiped off the fingerprints on the knife handle, then left Zhang Xia's house, quickly returned to his own home, took a shower and changed clothes... Then he returned to the sixth floor corridor, made a scream, and then quickly returned to the fifth floor.……"

"At this time, Uncle Sun on the fifth floor opened the door to see what was going on, and happened to see Wang Shengli had already gone out... In fact, he had just come down from upstairs!"

"The whole building was alarmed... Everyone came to the door of 602, knocking and banging on it. After a while, Wang Shengli, who had been blocking the door, was the first to kick it open and saw Aunt Zhang, who was already dead.……"

Bang!

Wu Nan closed the folder and said calmly,"That's it, so Wang Shengli is the murderer!"

"In addition!

According to the wounds and the amount of bleeding on Aunt Zhang's body, the murderer must have been sprayed with blood.

He needed to take a shower and change clothes.

According to the psychological pressure the murderer was under at the time, it can be judged that the murderer would probably take off all his clothes and keep washing them to ensure that there was no blood of the victim on his body.

If he did not use this method, he might feel that he was not clean!

If the bloody clothes were not burned, they should have been repeatedly washed.

……"

"Therefore, I suggest that you check the water consumption of all residents in the building on the day of the incident, with a focus on Wang Shengli’s home. I guess the water consumption must have been very large!"

"That's it!" Wu Nan finally finished speaking, holding the cup and began to drink water again.

The room was silent!