In the afternoon, the office of the Qingcheng City Police Department.

Captain Yang stood in front of everyone, looked at the file in his hand, and said in a solemn tone.

"The identity of the deceased has been investigated. ”

"The name of the deceased: Han Xiaoxiao, age: 21 years old! ”

"She has another identity...... The daughter of Han Pingfeng, the chairman of Haifeng Group!"

Hiss –

After everyone heard the identity of the deceased, they couldn't help frowning.

This identity...... It's tricky!

Haifeng Group is one of the top 50 enterprises in the country. Hundreds of billions of profits every year!

As the daughter of the chairman, Han Xiaoxiao's status can be described as very noble.

is such a girl, but today, the fragrance of the jade has fallen, which is regrettable.

Captain Yang continued, "According to our investigation, Han Xiaoxiao suffered from a certain degree of depression since she broke up with her ex-boyfriend before her death. ”

Bai Yan rubbed his chin, took Captain Yang's words, and analyzed, "A person suffering from depression can't be considered an incredible move if he jumps off a building to commit suicide. Therefore, the reason why criminals don't kill Han Xiaoxiao by other methods is perhaps to make us think that Han Xiaoxiao's death is just a simple suicide!"

Captain Yang nodded, agreeing with Bai Yan's point of view.

"By the way, Detective Bai, have you gotten the surveillance of the mall?" asked Captain Yang.

"If you get it, you get it. It's just that ......" said this, Bai Yan also had a painful face, "It's just that the topmost layer of surveillance has been broken a few days ago, so we can't be sure who the criminals are." ”

The surveillance on the 15th floor was broken, and the police had no way of knowing who had gone up to the rooftop except the deceased.

Naturally, it is impossible to pursue the murderer in time.

As for the specific murderer by looking at the surveillance on the 14th floor.

Ahem......

This is more difficult.

On the 15th floor of the mall, there is a high-end western restaurant, and there are hundreds of people in this morning's traffic alone.

If you go to check them one by one.

Even if the entire police force of their police station is dispatched, it will take at least ten days and half a month.

By that time, I'm afraid the criminals would have fled long ago!

"By the way, Detective Bai, did you find anything on the rooftop of the building?" asked Captain Yang.

"Half a footprint. Bai Yan gently spit out these words. "However, with only half a footprint, we have only half a footprint and we have only a limited amount of information. ”

"Can't you lock down the murderer?" Captain Yang had expectation in his eyes.

Bai Yan shook his head with a wry smile, "No." At least not for a short time. ”

"Then ......" Captain Yang took out his mobile phone, "We can only ask for foreign help!"

............

Four o'clock in the afternoon.

The rooftop of the commercial building where the crime occurred.

Cheng Nuo reluctantly followed Captain Yang and Bai Yan here.

"Captain Yang, I'm really not as godly as you think? I don't have any clues, so let me help you find criminals? Aren't you embarrassed for me?" Cheng Nuo complained as he walked.

Originally, Cheng Nuo, who had just finished inviting guests and earned enough favorability from Mu Leng and Su Xiaoxiao, just wanted to send the two girls home. Unexpectedly, Captain Yang called.

After making it clear that Cheng Nuo was around the commercial building, he asked Cheng Nuo to stay where he was and not move, and he and Bai Yan would arrive immediately.

So, Cheng Nuo, who was in a daze, was led to the rooftop by two big men.

Looking at Captain Yang and Bai Yan, looking at himself, there was a feeling of a big bad wolf looking at the little white rabbit.

Cheng Nuo was a little panicked.

He subconsciously covered his chest.

There is no one on the left and right sides of the rooftop, so that the heavens should not be, and the earth is not spiritual.

These two guys aren't going to ......

However, things did not go as Cheng Nuo expected...... Ahh

Captain Yang and Bai Yan took Cheng Nuo to a position not far from the high platform on the rooftop.

There, there is a relatively clear half of the footprint.

Bai Yan pointed to the footprint with his finger, "Ahh That's the clue. ”

"Now, Cheng Nuo, it's your turn to perform. Bai Yan shrugged.

Cheng Nuo looked down at the only clue left by the murderer at the scene, footprints, rubbed his chin, and groaned, "It should be 43 yards." ”

Bai Yan rolled his eyes, "Of course I know this." ”

If Bai Yan can't even guess this, then Bai Yan shouldn't be a police detective here. Just go home and farm.

But the problem is that the customers who came to the 15th floor in the surveillance camera screen did not have Cheng Nuo's accurate data ability, and it was difficult for Bai Yan to judge which people's shoe size was 43.

Cheng Nuo continued, "The foot length corresponding to 43 yards is 26.5 centimeters. According to the standard height calculation formula, height (cm) = footprint length (cm) × 6.876, that is, the height of the murderer, is 182.29 cm. ”

Bai Yan shook his head, "I naturally know what you said. However, the existence of such a thing as calculating height by foot length is too accidental. A person who is more than 1.9 meters may only have a shoe size of 40. And a person who is less than one meter six, the shoe size is likely to be 44, 45. ”

Therefore, the height calculated from the footprints can only be used as auxiliary data to find the murderer. And can't ...... as the main data. ”

Bai Yan is right.

The height calculated from the footprints is always unavoidable.

If the wrong criminal is locked, it will really be said that all the work has been lost.

"Don't worry, I'm not done yet. Cheng Nuo gave Bai Yan a calm gesture, staring at the footprints on the ground.

Then he looked up and glanced at the distance of the footprints from the edge of the rooftop and the height of the guardrail around the rooftop. In my mind, all kinds of data are constantly being calculated and reasoned.

If I remember correctly, the location where the deceased fell from the building was in the direction of this footprint, facing the direction of the guardrail in front of him, and the position after moving in a straight line for more than ten meters.

The footprints are lighter at the toes and darker at the heels. This shows that the murderer's body was in a state of extreme force when he left this footprint. If my guess is correct, the killer must have left this footprint here when he pushed the deceased downstairs.

The height of the roof parapet is 1.24 meters. The weight of the deceased was 51.24 kg. Before the deceased fell from the building, the initial velocity obtained in a horizontal direction was 3.85/m/s.

The distance between the footprints and the edge of the roof is 0.54 meters, and based on the location of the footprints, it can be inferred that the murderer pushed the deceased down the stairs in the ......

In his mind, Cheng Nuo used all the known data to build a model.

Then, simulate the force used by the murderer to push the deceased downstairs, the position in which he stands, the appropriate position of the force, the way of exerting the force, and the optimal height and weight of the murderer in accordance with the mode of force......

With this responsible for data computation. Cheng Nuo has barely done it, simple ...... Go back in time!