The special case team asked Officer Zhou to summon police officers and hold a briefing on the case in the conference room of the building. Different from the past, Professor Liang did not analyze the case and arrange tasks, but first gave everyone a puzzle.
This question is also a criminal reasoning test question of the US FBI (Federal Bureau of Investigation). Only those who can answer it correctly within one minute will be admitted to the FBI.
The enthusiasm of the police officers in the conference room was aroused, and everyone was eager to try and seemed very excited.
FBI test question: An old man in a wheelchair took the elevator downstairs. There was no one in the elevator except the old man. But when he got downstairs, the elevator door opened and people found that the old man was dead with a dagger stuck in his back.
How did the murderer do it?
The police officers present talked a lot. There was no murderer in such a small space as the elevator, but how to explain the fatal sword?
The police in the conference room couldn't come up with a reasonable answer despite racking their brains, and the one-minute time limit was about to expire.
Bao Zhan blurted out: Use the elastic rope and the downward force of the elevator to launch the dagger. This is the murderer's method of killing without being present.
Everyone suddenly realized that a police officer asked, how did the murderer determine the location of the old man in the wheelchair?
Bao Zhan explained: The person in the wheelchair must be near the elevator button, and the murderer's dagger was aimed in that direction. The murderer had connected a highly elastic rubber rope to the handle of the dagger and passed it through.
The other end of the rubber rope is tied to a fixed object above the elevator shaft. When the elevator goes down, the rubber rope will stretch as the elevator descends. When the length reaches the limit, the rubber rope will
When stretched and broken, the dagger will shoot out like an arrow or bullet due to its elasticity, killing the victim.
Professor Liang nodded in approval and said: The answer is correct. Next, I won’t tell you what we are looking for, but everyone can guess it.
Bao Zhan volunteered: There must be traces of the murderer in the elevator shaft or the machine room at the top of the elevator. I will definitely find them. I just don’t know what kind of rope the murderer used, steel wire, nylon rope, or carbon fiber textile rope?
Professor Liang said: Let’s study the neck first.
Su Mei took out a prepared anatomy diagram of the neck, which showed clear structures. The outermost layer is the skin, and underneath the skin are muscles and lymph nodes. There are longitudinal blood vessels and nerves on both sides, the respiratory tract and digestive tract are in front, and behind the fascia are
The spine. The neck is very fragile, with a lot of soft tissue. There is only one bone, with the spine and neck as the backbone. There are ligaments in the middle of the cricoid cartilage of the spine. The executioner can easily chop off the head by aiming at this position when beheading.
The special case team analyzed the entire murder process in detail.
The wound of the deceased was in the submandibular triangle. Only mechanical power can tear the head off alive. Suppose the murder tool is a steel wire. The steel wire covers the head and the other end is tied somewhere above the elevator shaft. Through the elevator, this kind of machinery creates a huge
The elevator continued to descend. First, the deceased was hung at a high place with his head against the top of the elevator. The steel wire was tightened and strangled into the neck and soft tissue. The first splash point of the deceased's blood appeared at the top of the elevator. The steel wire was strangled into the ligaments of the spine.
, that is also a very fragile part of the neck bones. Later, the head was strangled by the steel wire, and the steel wire quickly sank into the elevator's ventilation hole and disappeared.
The entire murder process was very fast, almost completed in an instant.
Because the force was applied instantly, although there were tear marks on the skin of the deceased's neck, the entire wound was very neat.
Then, based on the blood spatter trajectory and distribution map, it was determined that the deceased had been standing after death. After the steel wire cut off the head, the deceased's body convulsed and stiffened, and fell from the air. The headless body fell into the elevator, shaking for two seconds.
Down, it never fell.
The headless corpse stood in the elevator, with blood spurting out from its neck like a fountain, splattering all over the walls of the elevator.
Professor Liang said: The murder rope is very thin, has super strength and elasticity, and is at least as long as two stories high.
Officer Zhou asked in confusion: The wire rope hasn't been found yet, how do you know the length?
Professor Liang said: The deceased Wen Xiaowan took the elevator on the 42nd floor. After entering the elevator, he must press the button on the first floor. The murderer should have been in the elevator at that time. He covered the deceased's head with a wire and tied his hands behind his back. At 40
Leave on the first floor. Witnesses were on the 40th floor. The mother and son were on the 40th floor. The mother lowered her head to tie the child's shoelaces. She did not see the scene in the elevator. What the child saw was a person hanging in the air. This means that the length of the rope is at least
It's as high as two stories.
Hualong added: What the child saw was definitely not a corpse hanging in the air. The victim may not have died at that time, but was hanging in the elevator and struggling, with his legs struggling to lift back. This is why the child said that the sister did not
The cause of the leg. Later, when the elevator came up again, the witness saw the standing body.
Officer Zhou raised a question: It only takes a few seconds to go down from the 42nd floor to the 41st floor. It is impossible for the murderer to tie the victim's hands behind his back and put a muff around his neck in such a short time.
Professor Liang said: This question cannot yet be answered, and the time when the murderer committed the crime is still a mystery.
Before the end of the meeting, Professor Liang assigned tasks. Bao Zhan carefully inspected the elevator shaft to look for the tools and traces left by the murderer; Su Mei visited colleagues in the company where the deceased worked to learn about the relevant situation, especially to understand what happened with the deceased.
Contradictory people; Officers Hua Long and Zhou were responsible for investigating the people left behind in the building at the time of the incident, focusing on the elevator control room and those who knew the deceased worked overtime, and made a detailed list.
Professor Liang warned everyone to work carefully, as the murderer's name is likely to be hidden in this list.
Everyone took responsibility and started working quickly.
It was Friday when the incident occurred, and two days later, employees from various companies in the building began to go to work.
A female editor who worked overtime until late at night was killed in the elevator. Her head was severed, but her body was still standing. When this terrible news came, it was like a pot exploding. The colleagues of the publishing company where the deceased Wen Xiaowan worked were very shocked. , everyone was not interested in working, and three employees submitted their resignation reports that day. They had to take the elevator to and from get off work every day, and they felt very scared when they saw the elevator where the crime occurred. I believe that every colleague will have psychological shadow for a long time. .
Su Mei interrogated the editor-in-chief of the publishing company: Wen Xiaowan's boyfriend was also among the three resigned staff, right?
The editor-in-chief said: Yes, it is normal for publishing editors to change jobs and staff turnover.
Su Mei said: I think it is related to this case. Does your company have any competitors?
The editor-in-chief said: The competition is fierce. Almost every publishing company is our competitor. There is a cultural company on the 40th floor.
The editor briefly introduced that although their publishing company and the cultural company on the 40th floor were located in the same building, there had been a legal dispute in the past due to competition, and the cultural company ultimately lost the case.
Su Mei wrote down the editor's words with a pen, and then asked about Wen Xiaowan's boyfriend. His name was Yang Zi, and he was a colleague of Wen Xiaowan. He was a book planning editor and had written many suspense books. After the incident, the police went to his
The interrogation transcripts were taken at the residence and no suspicious points were found.
When Yang Zi was questioned, he acted very calmly. His attitude was that the matter had nothing to do with him and that he and Wen Xiaowan had broken up.
Su Mei reminded: You broke up only a week ago, and your colleagues confirmed that you had a good relationship before, but you had a big fight when you broke up.
Yang Zi tilted his head to one side and said in a calm tone: Isn't it always like this when lovers break up?
Su Mei said: Your eyes are a little red and swollen. It can be seen that you have cried. After investigation, we learned that you gave her a silk scarf.
Yang Zi glanced at Su Mei, lowered his head, and his tears flowed out again.
Yang Zi told Su Mei that before the breakup, Wen Xiaowan had straightened her hair and had an ion perm. She did not dare to sleep at night for fear of damaging her hair.
Shape. He knew a little trick: put a gauze scarf or silk material on the pillow. After getting up, the hair would not be easily deformed, so he gave her a silk scarf.
Su Mei said: It seems that you have a good relationship, but there is such a passage in your online log. Let me read it——
Every love I have is my first love. It is impossible to love one person for the rest of your life. There are thousands of beauties in the world, and there are countless beauties. I always want to appreciate different women and feel different kinds of love. There are passionate loves and unforgettable love.
Emotions, tender attachments, and a life lived like this will not be wasted. The pork with mustard greens is delicious, why should I eat one dish for the rest of my life?
Yang Zi interrupted Su Mei impatiently and said: This is my view of love, what's wrong?
Su Mei said: You wrote it in the diary to make her angry, right?
Yang Zi raised his voice and said, "I'm annoying her. Xiaowan is too jealous. She gets jealous every day. She gets in trouble with me when I look at photos of beautiful women. She even checks my text messages. I'm not allowed to do this or that. I'm annoyed."
If you die, just break up.
Hua Long and Officer Zhou made little progress in their investigation. The building property management department has several working groups: security group, maintenance group, sanitation group, and water and electricity group. When the elevator murder occurred, each group in the building had several working groups on duty at night.
Personnel. There were originally two people on duty in the elevator monitoring room. Because the only operating elevator on the night of the incident did not have monitoring installed, the two on-duty personnel took leave and left. Two security guards from the security team did not find anything unusual during their night patrol.
.
Hualong and Officer Zhou asked each of them one by one, asking everyone on duty to write down what they were doing at the time of the crime and their relationship with the victim.
Wen Xiaowan looks average, but has a hot figure. She is very fashionable in her clothes and has flowing hair. From the back, her back is very charming. The autopsy results showed that she was not sexually assaulted and no one on duty at night recognized her.
, only a few people have any impression of her.
Bao Zhan first conducted a careful inspection of the elevator machine room. There were traction wheels and guide wheels in the elevator machine room, and no traces of wire suspension were found on the base. Bao Zhan was a little disappointed, and then inspected the bottom of the elevator shaft, hoping to find wire ropes and the like.
The murder weapon was found, but nothing was found except rubbish.
When Bao Zhan was about to give up, he found a hanging point on the guide rail bracket at the top of the elevator shaft. The friction marks were very new and the anti-rust paint had peeled off. It was obvious that a heavy object had been hung on this point. It seemed that this was the
Where the wire rope is tied.
However, Bao Zhan had a new doubt: Where did the murderer enter the elevator shaft?
There are only two places:
1. The elevator machine room can be opened with a triangular key, which is available on duty.
Second, in the elevator, open the trap door on the top of the car, and the murderer can climb to the top of the car, or tie the steel wire to the guide rail bracket.
Although no murder tools such as wire ropes were found, Bao Zhan found a strange thing in the trash can.
Bao Zhan said: I checked the trash cans at the elevator entrance on the 42nd floor, the 41st floor, and the 40th floor, hoping to find the crime tools thrown away by the murderer. I found a strange thing in the trash can.
We often see this kind of thing, but now it looks weird.
Hualong said impatiently: What is it? From now on, you can just say it directly, I am most annoyed by your pretentiousness.
Su Mei smiled and said: Xiaobao has always been very strict, what exactly is that?
Bao Zhan took out an evidence bag and said: A strange banana with tape wrapped around it and a hollow inside.
Professor Liang said: Xiaobao, on which floor did you find it?
Bao Zhan said: The trash can on the 41st floor looks like it has not been cleaned for at least two days.
There was a banana placed in the transparent evidence bag. The peel was intact and the interior was hollow. Strangely, the banana was still wrapped with tape.
Professor Liang looked at it carefully and asked everyone: Who can tell me what this banana is used for?