In the narrow corridor outside the bathroom, Meng Yuan's eyes swayed back and forth on the faces of Sun Yu and Ma Youran.

After Ma Youran finished speaking just now, the corners of Sun Yu's mouth trembled. Meng Yuan realized that Sun Yu must have thought of another almost impossible situation, and the reason why he didn't say it out loud was because it was too unbelievable.

Ma Youran obviously thought of the same possibility, so Sun Yu was moved.

Ma Youran looked at Sun Yu's indifferent expression and said: "The murderer saw Ma Yimeng outside the door and immediately had the urge to steal Ma Yimeng's blood.

Ma Yimeng should have been at the location of her body at that time, and the murderer walked directly into the stationery store, picked up the transparent tape from the shelf, stuck it to Ma Yimeng's mouth and cut her wrist."

Meng Yuan opened his mouth and spread his hands vigorously, "What about the boss? He didn't notice?"

"No!" Ma Youran replied affirmatively, "After killing Ma Yimeng, the murderer walked to the door with a container containing blood, and killed the boss along the way.

When he was about to leave, he heard the sound of water flushing in the bathroom, and then came back and killed Liu Luyao."

"Container?" I don't know if it was because the victim this time was a child. Meng Yuan's thinking was extremely confusing. He couldn't keep up with Ma Youran and Sun Yu's rhythm.

Sun Yu took out a cigarette and stuffed it into his mouth, "Ma Yimeng's blood was obviously taken away. The murderer had a strong desire for blood, but he did not suck blood directly at the scene.

I think for him, what he wants is not to drink human blood directly, but maybe it has to go through a processing process, so he needs a container to hold the blood.

Liu Luyao died in the bathroom, and her blood was not taken away, which shows that the container she brought was not very big and could only hold the blood of one child."

Sun Yu took another look at the scene in the bathroom, "After the wrist is cut, the blood will obviously splash due to the rupture of the artery. This situation did not appear in Ma Yimeng and Liu Luyao.

The murderer's hands were very powerful. While cutting the wrist of the deceased, he clasped the deceased's arm with one hand, compressing the blood vessels in the arm, and in this way restricted the blood flow rate."

Meng Yuan finally understood what Sun Yu meant. This kind of killing method takes a certain amount of time.

It stands to reason that the murderer should have killed the boss and Liu Luyao directly after getting the blood, but Liu Luyao died in the same way as Ma Yimeng, both were killed by the murderer's slow bleeding.

Ma Youran whispered: "He found a plastic basin to contain Liu Luyao's blood. The fact that he didn't take it away proved that he had certain requirements for the container. In his eyes, the plastic basin was contaminated with blood.

But he still killed Liu Luyao in this way. I felt that he was showing off his skills, provoking the police, and telling us that he had enough time to take the blood of two people, but he just couldn't do it because the container was limited."

Evidence had not yet been collected at the crime scene, and the cigarette in Sun Yu's mouth had not been lit. He took a symbolic puff and let out a long breath.

"Wait!" Meng Yuan suddenly discovered a very serious problem. He looked at Ma Youran in horror, "During the whole process... the stationery store door was always open?"

Ma Youran pursed her lips and nodded vigorously.

"Is he crazy?" Xia Lan, who heard several people discussing at the intersection, exclaimed, "What if someone finds out?"

"He's not crazy, this is how he should behave!" Ma Youran looked at Sun Yu and said, "If someone discovers him, isn't it just a matter of killing a few more people?"

Sun Yu walked out of the stationery store with a cigarette in his mouth, sat on the steps at the door and lit the cigarette.

An Yue had been outside the door. She and Xia Lan, who followed Sun Yu out, looked at each other. The two of them remained silent and looked at Sun Yu, who was smoking on the steps.

"call--"

After seeing so many serial killers over the years, this was the first time that Sun Yu saw such a pervert who was indifferent to all external factors.

He has no reverence for life and no concern for potential dangers.

He cannot be a madman who puts himself in danger, so he is strong and believes that he can escape unharmed in the face of various emergencies.

So when he was killing Ma Yimeng, he didn't care at all that his boss could be found at the counter at the door at any time, because he was confident that he could shut up the boss immediately when he found him.

Likewise, he kept the door open during the entire process because he was confident that as long as someone came in, he would be able to deal with them as soon as possible.

"Huh?" Sun Yu frowned, "Then why did he close the rolling door?"

A numb scalp feeling swept through Sun Yu's body instantly. He stood up suddenly, looked back at the door of the stationery store and then looked at the opposite side of the stationery store.

There is a wall on one side of this alley, and scattered storefronts on the other side. Opposite the stationery store is a wall, and behind the wall is an old-fashioned family courtyard.

Sun Yu's eyes crossed the wall and kept scanning the old building behind the wall.

Suddenly, he saw a figure in a window on the fifth floor of the old building opposite the stationery store.

The figure seemed to realize that Sun Yu had discovered him, and immediately retracted.

Although he only glanced at it from a distance, Sun Yu still caught a piece of information. The figure had long hair shawl.

"The murderer is in the yellow-lit room on the fifth floor opposite." Sun Yu pointed in the opposite direction and yelled, "She has shawl hair and is a woman!"

With that said, Sun Yu rushed towards the wall directly.

Xia Lan reacted immediately, said "call for reinforcements" to An Yue and then chased after Sun Yu.

The height of the wall was only two meters. There was a row of cars parked under the wall. Sun Yu jumped directly onto the roof of the car, grabbed the top of the wall and climbed in.

Xia Lan followed closely behind and followed Sun Yu into the family courtyard.

"What's going on?" Xiang Fei and the other three came out after hearing the noise, only to see Sun Yu and Xia Lan running into the opposite community one after another.

An Yue looked dully at the direction in which the two disappeared, and said hesitantly: "Sun Yu said that the murderer is on the fifth floor of the building opposite. She has shoulder-length hair and is a woman."

An Yue hasn't come to his senses yet. Why did Sun Yu suddenly see the murderer? How did he determine that the woman was the murderer?

Xiang Fei rarely had an idea. He looked at Ma Youran and said, "Some perverted killers will return to the scene of the crime after killing someone to admire their masterpieces, right?"

Ma Youran nodded slowly, "Indeed, but the murderer's request was for blood, and she didn't leave anything worth appreciating on the body, so it doesn't make sense.

But based on the profile we just gave of her, which is arrogant, arrogant, and loves excitement, she can indeed do such a thing."

Meng Yuan looked back at the half-hung rolling shutter door of the stationery store and suddenly realized.

Meng Yuan said: "We have been discussing the character of the murderer just now. She was so arrogant and didn't close the door when she killed. Why did she close the door when she left?

I think Brother Yu is aware of this problem. After closing the door, there is an obvious alarm. If someone checks this place at night, he will definitely open the door and turn on the lights, so that he can notice it immediately."

An Yue had a little more praise for Meng Yuan and Ma Youran in her heart.

One of them is good at traditional criminal reasoning and the other is good at criminal psychology. Together they can definitely stand on their own.

After listening to the two people's analysis, Xiang Fei was about to go over to help, but was grabbed by Ma Youran.

"Don't go, don't forget that the murderer may be a spy, and her target may not be just the blood of children."

After hearing Ma Youran's words, Xiang Fei and Meng Yuan glanced at An Yue in unison, and immediately gave up their intention to help.

"Don't worry about me, hurry over and help, this is an order." An Yue said suddenly.

An Yue's words stunned the two of them. One of the confidentiality agreements was to unconditionally obey An Yue's command. The two immediately followed Sun Yu's path into the community.

Ma Youran glanced at An Yue, with a faint smile on her lips, and sat directly on the steps, waiting for the arrival of the forensic team.

······

Sun Yu and Xia Lan broke into the family courtyard and arrived at the downstairs of the unit.

The Family Courtyard was once the family home of a large state-owned enterprise on Zhengqi Street. It is a seven-story building with almost all rooms occupied.

It’s not that the houses here are so comfortable, how can the old residential complex compare with the newly built luxury residential complex in Mengshan City in recent years?

The biggest advantage here is the geographical location. As long as you own a house here, you can enter the top schools in Mengshan City from elementary school to high school, which is the so-called school district housing.

Previously at the entrance of the stationery store, Sun Yu initially judged that the distance between them and the unit building was only more than 100 meters, but he did not expect that behind the wall was an electric vehicle parking lot.

After going around, we had to cross a green belt, and it took us a full five minutes to get downstairs.

Xia Lan took out his pistol and loaded it, waiting for Sun Yu's command.

This time, even if Sun Yu didn't explain, Xia Lan didn't ask why. She believed in Sun Yu without any reservation, which made Sun Yu feel a lot more comfortable.

The two walked into the unit building. It was a two-unit structure with one elevator and no elevator.

There are only voice-activated lights in the stairs. They are old and old. Some lights have very low brightness, and some do not light up at all.

The door to the east room on the fifth floor was ajar, and the figure Sun Yu saw earlier was in this room.

Xia Lan directly raised his pistol and pointed it at the door. Sun Yu pushed hard and took a step back.

The door opened, with a faint light on inside. Sun Yu and Xia Lan walked in one after the other.

The house had a structure of three bedrooms and one living room. There was no light on in the living room, and there was only one bedroom with the light on, which was the bedroom that Sun Yu found.

Arriving at the door of the bedroom, Sun Yu immediately noticed a goblet in front of the dressing table.

There was some red liquid at the bottom of the goblet, which anyone could associate with blood. There were no obvious marks on the mouth of the goblet, so it was suspected that the murderer had used a straw.

"You should run away." Xia Lan sighed.

When Sun Yu came to the dressing table, he noticed that there was something crystal-like at the bottom of the cup, which looked like ice cubes. Then Sun Yu lay on the rim of the cup and smelled it for a long time.

In addition to the smell of blood, it seems to have a sweet taste, and there seems to be some milky flavor?

Looking at the blood at the bottom of the cup again, there is indeed a faint white color.

Ordinary cold milk will not have a milky flavor!

After taking a glance at the situation in the bedroom, Sun Yu came to the kitchen.

Sure enough, there was a small casserole on the stove, and there was some white liquid in the casserole, which must be milk.

There was a white mark on the casserole, which was left after boiling the milk. According to this mark, it is inferred that the murderer boiled about two liters of milk, which was definitely not able to be contained in a tall glass.

He mixed all the blood at once!

"Notify the people who came for reinforcements that the focus of the investigation is women. They are most likely to be carrying a larger package or a trolley suitcase." Sun Yu said to Xia Lan.

After saying this, Sun Yu came to the bedroom and stood at the window looking at An Yue and Ma Youran outside the stationery store opposite.

The forensic team and the criminal police team have arrived at the scene, and a blockade has been put up outside the stationery store. Outside the blockade are Liu Aoqi and Guo Ruifang, who are crying with each other.

The head teacher looked shaky. If Li Sinuo hadn't supported her, she would have collapsed on the ground.

According to the current situation, the murderer came to this house after killing people and taking blood. She boiled milk and mixed it with a kind of fructose and the blood.

Enjoy your trophies while observing the situation in the stationery store.
Chapter completed!