Bro, you are a policeman, not a thug.

Xiao Mu did not look at the young man who was burned and screaming.

Instead, he squatted on the ground and looked at the glass marble.

Perception, sight, hearing, do not detect it.

How did it appear?

When it appeared, the young man's body suddenly burst into flames.

How can this be done?

Xiao Mu's brain is analyzing, reasoning, and even calculating.

Suddenly, his body shook and his expression became strange.

A possibility came to mind.

Marbles, always here?

It's just ignored because of the angle, the position, the human perspective.

Its purpose is not to set youth bodies on fire at all.

Just to attract his attention and make him bow his head?

Was it the moment he lowered his head that the young man's body burned?

What did someone do to the youth during this process?

Xiao Mu raised his head and looked around.

His eyes instantly froze on the window sill of the stairwell.

Found a marble again!

This marble is very special, transparent and attached to the glass.

Xiao Mu moved his eyes and looked out the window with a puzzled expression.

wrong.

It’s the same problem just now.

Why can glass marbles cause an open flame and ignite a young man's body?

Xiao Mu suddenly squinted his eyes because he was hit by the sunlight outside.

Sunlight?

Xiao Mu's eyes suddenly widened, he looked at the glass marbles again, and reached out to pick them up.

It is obviously spherical, but as it is lifted up in the palm of the hand, it looks like...

magnifier!

Gather light?

As we all know, magnifying glasses can focus light and heat it up.

When the temperature reaches the ignition point of combustible materials, the material will burn.

Still not right... Xiao Mu's pupils shrank.

At that moment, the young man's body was moving.

Even if this glass marble has the function of a magnifying glass to focus light, it will not instantly ignite the young man's body.

It takes a process for the magnifying glass to focus light and heat it up, but the temperature is not enough!

Xiao Mu's eyes moved and looked at the young man's body, especially his clothes.

Recalling the moment when the young man's body burned, it emitted something like an explosion and spit fire.

I wrinkled my nose and smelled a strange smell...garlic?

garlic?

Xiao Mu's expression changed, and he showed an expression of sudden realization.

I know why the young man's body is burning.

white phosphorus!

The smell of white phosphorus is similar to garlic.

It is characterized by igniting at about 40°C in humid air and slightly higher in dry air.

There is white phosphorus on the young man's clothes!

That glass marble has a light-gathering function, and the temperature of the light can easily exceed 40°C in an instant!

But just because he found the reason, Xiao Mu looked solemn.

How could someone have calculated that they would appear in the stairwell and prepared two marbles in the stairwell in advance?

One to attract his attention, and one to ignite the white phosphorus on the young man?

Xiao Mu's scalp was numb.

I quickly reached the sixth floor, and then went to the eighth floor, breathing a sigh of relief.

He found glass marbles on the treadmills on the sixth and eighth floors.

One is in a hidden location on the ground and one is on the window.

There are two on each level!

"You figured that the young man would definitely take the stairwell, right? Did you also assume that someone would catch him in the stairwell?"

Xiao Mu murmured, "But that's wrong. How do you determine the angle at which the marbles focus the light?"

so……

Are you using some method to let the light shine on the marbles and use the marbles to shine on the young people?

Kill and silence!

In other words, you are nearby... Xiao Mu raised his head and looked out the window.

After searching for two minutes, no unusual person was found.

"Something."

Xiao Mu smiled and said, "This will arouse my interest!"

…

Hospital.

The youth's burns were treated briefly.

Curling up on the hospital bed, his hands were trembling and his eyes were empty, as if he had lost all hope.

Xiao Mu looked at him coldly.

Like looking at a... warning line!

"Early warning line?"

Zhao Xiaotang's face was ugly, "Are you saying that the traps in the apartment area were all deliberately arranged by certain people?"

"That's right."

Xiao Mu nodded and looked at the young man, "If we can find this community, we will fall into the other party's trap and touch the early warning line. This young man will not only notify certain people, but also activate the trap."

"Using the child to light the sewage well and, if unsuccessful, make the window fall down. These things were arranged by some people in advance."

"It's just that he was smart and added some things in the sewage well and in the windows. In fact, he was superfluous."

"But those people seemed to know him well, knew that he might mess things up, and knew that the police would find his location, so they also installed a trap in the elevator of that residential building."

"If this trap is activated, it means that the young man has been completely exposed, and it will be his death."

"Those people will also come to kill people immediately and clean up all the tails."

"In other words, those people originally wanted to kill him and made preparations in the stairwell in advance."

"There was a man guarding outside the apartment specifically to kill the young man, but he was allowed to run away!"

If it had been anyone else, the young man would have been burned to death.

The other party's killing methods were so powerful that even Xiao Mu was almost deceived.

But one thing is certain, the young man in front of him should know something.

Only people will kill him to silence him, or they will silence him only if they have no choice but to silence him.

Why do you say that?

Because this young man is a waste who is not good enough to do anything but always makes trouble.

He turned the high-end "accidental murder" into a low-level "premeditated murder".

What else is this if not a waste?

Any teacher would give up on this kind of "disciple", right?

What's the point of keeping such a waste?

It makes me think that some people had to kill him to silence him at the last moment.

Have you guessed something?

"Your master is your relative, right?"

Xiao Mu looked at the young man coldly.

The young man's pupils dilated instantly, then quickly shrank, and he lowered his head.

The police have already found out the identity of the young man.

Wu Hao, 26 years old, from another province, came to Yongcheng two months ago.

The social relations of the suspect Wu Hao have almost been found out.

Xiao Mu held his mobile phone and looked at a document.

Liang Guanyu, male, 48 years old, from another province, was listed as a missing person 14 years ago.

He is a relative of Wu Hao and is also Wu Hao's uncle.

The reason why this person was found is that Wu Hao's other relatives have been monitored by public security personnel from other provinces.

No suspicious points have been found through investigation.

The only suspicious person is Liang Guanyu who disappeared 14 years ago.

The key.

The file of Liang Guanyu before his disappearance was very clean.

And very... awesome!

Not only is he a doctor, but also an assistant professor. When he was young, he won a place in the International Mathematical Olympiad.

He works in mathematics and has very strong mathematical analysis and calculation skills.

He can be said to be a genius in the eyes of ordinary people!

"Mathematics? Calculation? Accident?"

Xiao Mu breathed a sigh of relief, "It's this kind of person!"

Only this kind of person can create so-called accidents.

And the killing methods that ordinary people can hardly understand!