◎Chapter 23 Snow Footprints

The small courtyard where the snow falls, the low courtyard wall, and a jar in the corner, in which the oleanders planted are bent to the ground by the heavy snow. A cordon was put up at the entrance of the courtyard, and many neighbors and passers-by gathered around the door. A policeman shouted: Who is going to inform the relatives of this family, do you know anyone?

The special case team looked at the footprints on the snow in the courtyard, and they were waiting for the arrival of the footprint identification experts of the Municipal Bureau.

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

I don't believe that this line of shoe prints was left by a child.

Su Mei said: However, this is clearly the footprints of a pair of children's shoes, and it is impossible for big feet to wear small shoes, and I can't wear those shoes.

A shoe print contains all the information of a person.

Gender, height, weight, age, walking characteristics, disability, shoe texture, place of origin, newness, where have you been...... In criminal investigations, scientific judgments can be made based on shoe prints.

The leaders of the municipal bureau and Professor Liang drove here, and the footprint identification experts also brought a group of trainee police officers to observe and learn from the site. The small courtyard was lively, and everyone walked carefully along the wall, not to destroy the shoe prints in the courtyard, and stood in a row in the corridor, watching with great interest how the footprint identification experts extracted the shoe prints in the snow.

In the past, the police had poor criminal investigation equipment: shoe prints on the mud were mostly extracted with plaster, and snow footprints could only be photographed for evidence, and then the footprints left by the suspect slowly disappeared.

The expert first looked at the shoes, then he grabbed a handful of snow, held it in a ball, crumpled it and threw it away, then bent down to look at a shoe print with the naked eye, and finally, he took out a magnifying glass, walked to a clear shoe print in the middle of the yard, and knelt down.

The trainee officers snickered quietly, and after a while, the footprint identification expert said a word, and the scene fell silent.

The footprint expert said in a tone of disbelief: "This is impossible, I have never seen such strange shoe prints."

Professor Leung asked: What's so strange?

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

Everyone looked at each other, and a trainee police officer exclaimed: Is it a little ghost?

A terrifying image flashed in his mind: at midnight, the courtyard was empty, and a footprint appeared on the snow, something stepped on it, and clear footprints snaked forward...... A pale boy walked into the wall, turned sharply, revealing a bloodless face that slowly vanished.

Bao Shu asked: Is this line of footprints moving forward in the way of retreat?

The footprint identification expert shook his head in denial.

The dragon said: Is it wearing shoes upside down, and the left foot wears the shoes of the right foot?

The footprint identification expert said: No, I need an instrument to identify it.

The footprint identification expert took out a three-dimensional footprint laser scanning acquisition analyzer, which can quickly, accurately and non-destructively extract the three-dimensional footprint of the scene. Using modern laser scanning 3D measurement and computer technology, the digital collection, storage and transmission of the original form of the three-dimensional footprint on the site are realized, and the 3D data of each part of the footprint is directly recorded and displayed.

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

A trainee constable asked: What should this person be like?

Footprint identification experts said: According to the step length data, the shoe prints do not meet the characteristics of adults' feet, support, and feet, and the person who stepped on the shoe prints should be a child.

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

The footprint identification expert said: I find it incomprehensible - this child is very strange, the length of the shoe print - the amount of margin - the difference between the inside and outside + the difference between the traces × coefficient = height, the child's height is 1.60 meters, and the weight is 80 pounds.

Hualong said: It's really unbelievable, a six-year-old child, 1.60 meters tall, weighs 80 pounds, this child is too terrifying.

Professor Liang said: Maybe it's not a child, but a woman, an old lady with her feet wrapped, and the three-inch golden lotus can be worn into these children's shoes. There is also the possibility that any of you present can answer how you would leave this courtyard if you were the murderer.

After the murderer kills someone, he leaves the scene and inevitably leaves footprints on the snow in the yard.

How should it be disguised?

The only answer: the murderer

Leave someone else's footprints to confuse the police.

The trainee police officers present couldn't think of it, Bao Chu said: The murderer left the footprints of the child, and the weight and height indicate that the murderer may be a woman, she stood upside down, put on shoes with her hands, and left the yard.

Professor Liang said: That's right, the American reasoner Carl wrote a classic detective reasoning - "Footprints in the Sky", a whimsical trick, an impossible crime with hands and feet upside down, and also won Carl the reputation of "the king of the secret room".

Bao Chu said embarrassedly: I have read this article, and I should thank Carl for inspiring me.

Professor Leung told the trainee police officer: Criminal investigation reasoning is a kind of logical imagination. Outside of this small courtyard is the largest crime scene. I'll give you two more little riddles about footprints, and see who can solve them, so you don't have to answer them. A lonely old man died in the hospital, the old man was pierced from the mouth with a sharp weapon, there was no murder weapon around, only the old man's own footprints, who was the murderer?

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

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

A lumberjack** died in the snow, her left arm was cut off, blood stains were on a fallen dead tree, the axe was thrown nearby, the lost arm was missing, there were many trees in the snow with cable car lines on them, and there were only the footprints of the lumberjack herself on the ground. The footprints stretched several hundred meters, and it can be judged that the female worker had walked in the snow after her arm was cut off, and the clothes she had taken off were scattered on the snow for several hundred meters. The autopsy revealed that the naked woman's body contained her husband's semen...... Half a year later, an apprentice at a game restaurant near the scene of the crime was arrested on suspicion of raping the proprietress and found that the apprentice was wearing a gold ring lost by a lumberjack.

Excuse me, who is the murderer? How did the killer do it?

There was a lot of discussion among the trainee officers, but none of them could answer. Bao Chu thought about it for a long time, but couldn't think of an answer. Professor Leung allowed everyone to think slowly, and next, the trainee police officer assisted the special case team to go deep into the scene, and every corner and item in this room had to be carefully investigated to find the traces left by the murderer.

Ms. Yun's husband had drunk water before taking the poison, and only his own fingerprints were on the cup.

An empty bottle of toilet detergent was found in the garbage basket, a Zippo lighter was placed on the computer desk, which required special oil, and an intern police officer found an empty Zippo fuel tin can under the bed. Ms. Yun's face was burned, and it should be the fuel used. The bed was flat, apparently made, and Bao Chop used tweezers to extract the hair from a brush.

Just by using a magnifying glass, you can tell that there are four types of hair on the brush.

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

Who are the other two people besides the deceased couple and the other?

Hualong looked at the big bed in the bedroom and said: It's too **, the four of them sleep together.

Professor Liang said, "Xiaomei, check their computer.

Su Mei moved his wrist and said: In your eyes, this is a computer; In my opinion, it's a sponge. I'm going to squeeze all the water out of this sponge, and there's not a drop left.

A lot of jaw-dropping information was found in the computers of the deceased couple, who joined a couple-swapping club. This club has its own forums and QQ groups, which are divided into sections by region. In the city where the deceased couple was located, there were more than a dozen VIP members.

Su Mei infiltrated the QQ group where the deceased couple were located, and the group owner was discussing the weekend party. Su Mei did not speak or provide a photo, and was quickly kicked out. Professor Liang asked Su Mei not to act rashly, the murderer may be hiding in this QQ group.

Bao Chu said: It's better to catch them all while they are partying.

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

Professor Liang said: The murderer has just killed someone, so he may not attend this party, but he can rule out other suspects and narrow down the scope.

The VIP membership verification of this ** dating club is very strict, and new members must show a photo of the husband and wife and a copy of the marriage certificate. The police decided to draw Long and Su Mei, Bao Chu and the female forensic doctor, pretending to be two couples, and infiltrated this ** dating club for undercover investigation. They presented forged photos and scanned copies of their marriage certificates and joined this couple-to-wife QQ group.

There are still a few days left before the weekend party, and the members of the group are looking forward to this ** party. The group owner said to sign up

There are already five couples, plus two new couples, a total of fourteen people, ** big scuffle, the opportunity is rare, and the rest of the couples are encouraged to join together.

The group owner's screen name is called Covenant of the Heart, and the group owner's wife is also the group administrator, called Mrs. Red Sleeves.

The painting dragon is called the Battle Dragon Samurai in the group, Su Mei is called Mei Beauty, and the screen name of Bao Chop is called Baozi.

The female forensic doctor was very excited and active in the group, and she gave herself a charming and delicate name: Little Soft Girl.

Block the QQ number and take a screenshot of the chat history:

Little soft girl?? 9：21：54

Ask for support, will warm the bed.

Low-key _ men?? 9：21：59

How old are you, have you swapped before?

Little soft girl?? 9：22：03

Ask to lick your face, beg your breasts, beg to fit, beg to be ravaged.

Fire Phoenix?? 9：22：14

Hehe, my little sister is so direct.

A Covenant of the Heart?? 9：22：17

Where's your husband? Look at you guys, video.

Little soft girl?? 9：22：22

Please, I'm in the company, and my husband also works, hasn't it been verified? Hate hate hate.

Mrs. Red Sleeves?? 9：22：50

Lustful husband, I'll watch it on the weekend. The little soft girl looks better when she strips naked, hehe, and I want to see how many green hats I can put on you.

Low-key _ men?? 9：22：58

Mei Beauty, are you there?

Pretty Woman?? 9：23：02

Oh.

Low-key _ men?? 9：23：58

video, look at you, or you send a few more sexy photos of black silk. Mei Beauty, you are so beautiful, saliva, hehe, I can't believe that a beautiful woman like you would come to our party. When the time comes, I'm going to ...... I don't pity Yuha.

A Covenant of the Heart?? 9：24：11

Haha, Mei Meiren is mine, the little soft girl and the fire phoenix are also mine, I want to hug left and right, low-key, you go play with my wife. My wife is very prodigal, if you don't believe it, you go and ask the men in the group.

Pretty Woman?? 9：24：56

Hmph, aren't you afraid of my little boots? It hurts to kick someone.

War Dragon Samurai?? 9：25：01

What are the rules for our gathering?

Little soft girl?? 9：25：06

I've played it once before, but there aren't that many people.

Mrs. Red Sleeves?? 9：25：11

Samurai is Mei Beauty's lover, right? If there are many people together, what are the rules, whoever you want to play with, drag them over and play. The premise is to wear a small raincoat and have fun, how exciting. I look at your photo, it's pretty handsome.

Fire Phoenix?? 9：25：16

There are also occasional handsome guys. I've also only played with four people swapping.

Bun?? 9：25：18

Hello everyone, the little soft girl is my wife, she is not usually like this, I was dragged here.

A Covenant of the Heart?? 9：25：24

What to grab, I'm the leader of the group, I'll choose first, you just watch me perform first.

Pretty Woman?? 9：25：26

Hmph, I'm going to pick you. I choose a man, and if I don't see it, I kick it aside with my little boots, and if I look at it, I hook my fingers.

Low-key _ men?? 9：25：36

Mei Mei is really a queen, cold, my wife and I are willing to be your husband and wife slaves, kneeling under your black stockings and high-heeled boots. You cross your waist, hold a whip, arrogant and cold, unbelievable, you are the queen in my heart, wife, come and meet our beautiful queen.

Tender Dream Change?? 9：25：43

Hello, Queen, we are willing to serve you.

Mrs. Red Sleeves?? 9：25：48

Hehe, you are really not low-key, tender, you betrayed me again?

Little soft girl?? 9：26：08

Take slaves, and I will take slaves.

A Covenant of the Heart?? 9：26：12

I, I'm not a slave yet, haha.

Pretty Woman?? 9：26：19

Tired, I went down first.

Little soft girl?? 9：26：20

I'm looking forward to the weekend's ** party, I'm looking forward to it, and now that I think about it, I'm excited.