◎Chapter 23: Snow Footprints

A small courtyard with snow falling, a low courtyard wall, a jar was placed in the corner, and the oleander planted in the jar was bent to the ground by heavy snow. A cordon was pulled at the entrance of the courtyard, and many neighbors and passers-by surrounded the door. A policeman shouted loudly: Who will inform the relatives of this family, do you know anyone?

The special case team looked at the footprints on the snow in the yard, and they were waiting for the arrival of experts from the municipal bureau’s footprint identification.

Bao Zhan said: The murderer is not a bird, he can't fly, and as long as he leaves his footprints, he can't run away.

Hualong said: I don’t believe that this line of shoe prints was left by a child.

Su Mei said: But, this is clearly a pair of footprints made of children's shoes. It is impossible to wear big feet with small shoes. I can't even wear those shoes.

A shoe print contains all the information about a person.

Gender, height, weight, age, walking characteristics, whether you have any disability, the texture of the shoe, origin, newness and oldness, where you have been to... In criminal investigations, scientific judgments can be made based on the shoe printing.

The city bureau leaders and Professor Liang drove over, and the footprint identification experts also brought a group of intern police officers to watch and learn on the spot. The courtyard became lively, and everyone walked carefully along the wall, not destroying the shoeprints in the courtyard. They stood in a row in the corridor, and watched with interest how the footprints in the footprints extracted the shoeprints in the snow.

In the past, the police had a simple criminal investigation equipment: the shoe prints on the mud were mostly extracted with plaster, and the footprints on the snow were only taken to take photos and collect evidence, and then they watched the footprints left by the suspect slowly disappear.

The footprint identification expert first looked at the shoes, then he grabbed a handful of snow, held it into a ball, crushed it and threw it away, then bent down and observed a shoe print with his naked eyes. Finally, he took out a magnifying glass, walked to a clear shoe print in the middle of the yard, and knelt down.

The trainee police officers chuckled in a low voice. After a while, the footprint identification expert said something, and the scene became quiet and silent.

The footprint identification expert said in an incredible tone: This is impossible, I have never seen such a strange shoe print.

Professor Liang asked: Why is it strange?

Footprint identification experts say: This is not a human shoe print...

Everyone looked at each other and a trainee police officer exclaimed: Could it be a little devil?

A terrifying picture flashed in his mind: at midnight, there was no one in the yard, and a footprint suddenly appeared on the snow, something stepped on it, and the clear footprints meandered forward... A pale boy walked into the wall, turned around suddenly, revealing a bloodless face, and slowly disappeared.

Bao Zhan asked: Is this line of footprints moving forward by retreating?

The footprint identification expert shook his head and denied it.

Hualong said: Could it be that you wear shoes backwards and your left foot with your right foot?

Footprint identification experts said: No, I need an instrument identification.

Footprint identification experts have taken out a three-dimensional footprint laser scanning acquisition analyzer. This instrument can quickly, accurately and without loss. Using modern laser scanning three-dimensional measurement and computer technology, it realizes the digital collection, storage and transmission of the original form of the three-dimensional footprint in the field, and directly record and display the three-dimensional data of each part of the footprint.

Su Mei used computer animation to restore the collected data on the spot. In the animation, you can see how a row of shoe prints stepped on the snow, but there was no one on the shoe prints.

A trainee police officer asked: What should this person look like?

Footprint identification experts said: According to step size data, the shoe print does not meet the foot-loading characteristics, support characteristics, and foot-raising characteristics of adults. The one who stepped on this pair of shoe prints should be a child.

Su Mei said: Their child is dead, and this family has no children.

The footprint identification expert said: What I find difficult to understand is that this child is very strange, the shoe print length - the remaining amount - the difference in internal and external traces × coefficient = height, the child's height meter and weight is 80 kilograms.

Hualong said: It is indeed unbelievable. A six-year-old child is meter tall and weighs 80 kilograms. This child is too terrifying.

Professor Liang said: Maybe it’s not a child, but a woman, an old lady with foot binding, and three-inch golden lotus can be worn into these children’s shoes. There is another possibility. Who can answer here? If you are the murderer, how will you leave this yard?

After the murderer killed someone, he would leave the scene and leave the scene and would inevitably leave footprints on the snow in the yard.

How should we disguise?

The only answer is: the murderer

Leave other people's footprints to confuse the police.

The intern police officers present could not think of it. Bao Zhan said: The murderer left the footprints of the child, and his weight and height meant that the murderer might be a woman. She stood upside down, put on her shoes with her hands and left the yard.

Professor Liang said: That's right, American reasoningist Carl wrote a classic detective reasoning - "Footprints in the Sky". A whimsical trick and an inverted impossible crime, which also won Carl the reputation of "King of the Secret Room".

Bao Zhan said embarrassedly: I have read this article, and I should thank Carl for his inspiration.

Professor Liang told the trainee police officer: Criminal investigation reasoning is a kind of logical imagination. The biggest crime scene outside this courtyard is the biggest crime scene. I will give you two small riddles about footprints to see who can answer it. Bao Zhan doesn’t need to answer it. An elderly man died in the courtyard. The old man was stabbed through his mouth by a sharp weapon. There were no murder weapons around him, only the old man’s own footprints. Who is the murderer?

The footprint identification expert pointed to the ice cone under the eaves.

Professor Liang nodded and said: Another difficult one is a real case.

A female loggerhead died in the snow. Her left arm was cut down, and blood was stained on a fallen dead tree. The axe was thrown nearby. The lost arm disappeared. There were many trees in the snow, with cable car lines on it, and there were only the footprints of the female loggerhead themselves. The footprints extended for hundreds of meters. It can be judged that after the female worker's arm was cut down, she had walked in the snow, and her clothes were scattered on the snow hundreds of meters. The autopsy found that the naked woman had her husband's semen in the body... Half a year later, an apprentice in a game restaurant near the crime scene was arrested for suspected rape of the boss's wife. The police found that the apprentice was wearing the gold ring lost by the female logger.

Who is the murderer? How did the murderer do it?

The trainee police officers were talking, and no one could answer. Bao Zhan thought for a long time but couldn't think of the answer. Professor Liang allowed everyone to think slowly. Next, the trainee police officers assisted the special case team in depth to inspect the scene. Every corner and every item in the room must be carefully inspected to find the traces left by the murderer.

Ms. Yun’s husband drank water before taking the poison, and only his own fingerprint was on the water cup.

An empty toilet cleaner bottle was found in the garbage can. A zippo lighter was placed on the computer desk. This lighter required special oil. A trainee policeman found an empty zippo fuel iron can under the bed. Ms. Yun's face was burned, so it should be the fuel used. The bed was flat and obviously had been sorted out. Baozhan used tweezers to extract the hair from a brush.

You can tell by simply using a magnifying glass, and there are four types of hair on the brush.

This shows that four people once slept in the same bed.

Except for the deceased couple, who are the other two?

Hualong looked at the big bed in the bedroom and said: It's so shameful, four of them slept together.

Professor Liang said: Xiaomei, check their computers.

Su Mei moved her wrist and said: In your eyes, this is a computer; in my opinion, this is a sponge. I want to squeeze out all the water in this sponge without a drop left.

A lot of jaw-dropping information was found in the computers of the deceased couples. They joined a couple exchange club. This club has its own forum and QQ group, which is divided into multiple sections by region. There are more than a dozen members.

Su Mei sneaked into the QQ group where the deceased couple was located. The group owner was discussing the weekend party. Su Mei did not speak or provide photos, and was kicked out soon. Professor Liang told Su Mei not to act rashly, and the murderer might be hiding in this QQ group.

Bao Zhan said: It’s better to catch them all while they are gathering.

Su Mei agreed with Bao Zhan's idea, and she suggested: We can pretend to be husband and wife, sneak into this club, and attend the party.

Professor Liang said: The murderer just killed someone and may not attend this party, but other suspects can be ruled out and narrowed down.

The verification of this ** member is very strict, and new entrants must present a photo of the couple and a copy of their marriage certificate. The police decided to study and decide that Hualong and Su Mei, Bao Zhan and the female forensic doctor, pretend to be two couples, and mix into this ** dating club and undercover investigation. They showed fake photos and scanned marriage certificates and joined the couple exchange QQ group.

A few days before the weekend party, the members in the group are looking forward to this ** party. The group owner said that they had signed up.

There are already five couples, plus two new couples, a total of fourteen people, with a great melee, and the opportunity is rare, so the rest of the couples are encouraged to join together.

The name of the group owner is called the Spiritual Appointment. The group owner’s wife is also the group administrator, and is called Mrs. Hongxiu.

The dragon in the group is called the War Dragon Warrior, Su Mei is called Mei Jiaren, and Bao Zhan’s online name is Baozi.

The female forensic doctor was very excited and active in the group, so she gave herself a charming and tender name: Little Ruan Mei.

Block the QQ number and intercept a chat record:

Little soft girl??9:21:54

Please keep it, and you will be able to warm the bed.

Low-key_Man??9:21:59

How old are you? Have you ever exchanged before?

Little soft girl??9:22:03

Please lick your face, rub your chest, blend it, and ravage it.

Fire Phoenix??9:22:14

Haha, little sister is so direct.

The Covenant of the Spirit??9:22:17

Where is your husband? Check out you, video.

Little soft girl??9:22:22

Please, I am in the company and my husband works too. Hasn’t it been verified? I hate it and hate it.

Mrs. Hongxiu??9:22:50

I’m a lustful husband, let’s watch it again on weekends. The little soft girl looks better if she takes off her naked. Hehe, I have to see how many cuckolds I can wear for you.

Low-key_Man??9:22:58

Are you there, the beauty?

Beautiful lady??9:23:02

oh.

Low-key_Man??9:23:58

Video, look at you, why don’t you post more sexy photos of black stockings. Beautiful lady, you are so beautiful, saliva, haha, I can’t believe that a beauties like you will attend our party. At that time, I want... I won’t be merciful.

The Covenant of the Spirit??9:24:11

Haha, Mei Jiaren is mine, Little Ruanmei and Huo Fenghuang are also mine. I want to hug her left and right, keep a low profile, you can go play with my wife. My wife is very slutty. If you don’t believe it, go and ask the men in the group.

Beautiful lady??9:24:56

Humph, aren’t you afraid of my little boots? It hurts to kick people.

War Dragon Warrior??9:25:01

What are the rules for our party?
To be continued...