The special case team asked Officer Zhou to summon police officers and hold a case briefing 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. 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 mobilized, 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 deadly sword?
The police in the conference room couldn't come up with a reasonable answer even if they tried their best, 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 way 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 that 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 threaded it through.
Pass the ventilation hole of the elevator and tie the other end of the rubber rope 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
It will be stretched and broken, and because of its elasticity, the dagger will shoot out like an arrow or a bullet, 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 left by 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 string, or carbon fiber textile rope.
Professor Liang said: Let's study the neck.
Su Mei took out a prepared anatomy diagram of the neck, which showed clear structures. The outermost part 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 between the cricoid cartilage of the spine. When the executioner aims at this position when beheading, he can easily cut off the head.
The special case team analyzed the entire murder process in detail.
The deceased's wound was in the submandibular triangle. Only mechanical power can tear the head off alive. Assume that the murder tool is a steel wire. The steel wire covers the head and the other end is tied somewhere above the elevator shaft. A huge force is generated through the elevator.
The elevator continued to descend. First, the deceased was hung at a high place with his head on 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 was also a very fragile part of the neck bones. Later, the head was strangled by the wire, and the wire quickly disappeared into the elevator's ventilation hole.
The entire murder process was very fast, almost completed in an instant.
Due to the instantaneous force, 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 to the ground from the air. The headless body fell into the elevator and trembled twice.
Didn't fall.
Blood spurted out from the neck of the headless corpse 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 that the deceased Wen Xiaowan took the elevator on the 42nd floor. After entering the elevator, he must press the button for the first floor. The murderer should have been in the elevator at that time. He put a wire around the deceased's head, tied his hands behind his back, and left on the 41st floor.
Witnesses were on the 40th floor. The mother and her 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 was at least two floors long.
high.
Hualong added that 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
Later, when the elevator came up again, the witnesses 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 meeting ended, 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 an 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 asked the editor-in-chief of the publishing company: Wen Xiaowan's boyfriend must be among the three resignations.
The editor-in-chief said: Yes, it is normal for publishing editors to change jobs and personnel 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 very 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 working in the same building, there had been a legal dispute in the past due to competition, and the cultural company ended up losing 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
An inquiry record was 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 that you had only broken up for a week, and your colleagues confirmed that you were very affectionate before and 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 found out 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 didn't dare to sleep at night for fear of deforming her hair. He knew a little trick, which was to put a gauze scarf or something silk on the pillow.
, after getting up, her hair will not be easily deformed, so I 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 all your life. There are thousands of beauties in the world, and there are so many beauties. I always want to appreciate different women and feel different kinds of love. There are passionate loves and unforgettable love.
Feelings, tender attachments, and a lifetime like this will not be wasted. Braised pork with pickled vegetables 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. This woman, 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. She's so annoying."
No, let's break up.
There was no progress in the investigation by Hua Long and Officer Zhou. The building property management department has several working groups, security group, maintenance group, sanitation group, water and electricity group. When the elevator murder occurred, each group in the building had several people on duty at night.
Personnel. There were originally two personnel on duty in the elevator monitoring room. Because the only elevator operating on the night of the incident was not equipped with a surveillance system, the two on-duty personnel took leave and left. Two security guards from the security team did not find anything during their night patrol.
abnormal situation.
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 survey of the elevator machine room. There were traction wheels and guide wheels in the elevator machine room. 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 trash.
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 new doubts. 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 entrances on the 42nd, 41st and 40th floors, hoping to find the crime tools thrown away by the murderer. I found a strange thing in the trash can. We often use this kind of thing.
Commonly seen, but now it looks weird.
Hualong said impatiently: "What is it? You can tell me directly from now on. I'm 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 tape 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 tape. The peel was intact and the interior was hollow. The strange thing was that 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?