Fang Ling went to the fire door opposite, pushed it open, picked up a piece of carpet fragment, burned it with a lighter, and after there was a spark, the person left. Bai Xue, who was at the service desk, tried to look at the fire door opposite, but found no fire and smoke, and after about seven minutes, Bai Xue raised his hand: "Smell the smell." "At this time, I walked over again, and found that the burning range was similar to what the waiter found.

Zoro denied: "A killer sits in a fire door for seven minutes? Who can be sure that no one will go up and down?" Many hotels have a rule that employees are not allowed to take the elevator if they have less than three floors. Is he sure no one will go through the fire escape?

Continuing the visit, the room supervisor on the 15th and 24th floors said that she walked through the fire escape outside the 19th floor a few minutes before the incident, and she received a request from the walkie-talkie on the 17th floor to send a set of hot towels to the 17th floor.

Seven minutes later, when he entered the 19th floor, the waiter happened to look for the source of the fire, and he easily entered room 1916.

In the third simulation, Bai Xue's waiter arrived at the burning place, pretended to pat the spark with his hand, stood up after being burned, and then stepped on the spark with his foot, extinguished, and then Bai Xue turned around and walked towards the service desk, she followed the waiter's practice at the time, temporarily stepped on the fire extinguisher, and called the supervisor. This time was very short, and as soon as Bai Xue turned around, Zuo Luo reluctantly entered room 1916 and was not seen by Bai Xue.

In this way, the theory can be done, the other party has hackers, monitors the corridor, the waiter walks towards Mars, and the murderer enters the door. After the waiter called, the supervisor ran to the 19th floor, and the supervisor asked the waiter to open the fire door on the other side, hold the door against something to keep the passage clear, and then check the fire and contact the housekeeping manager. The housekeeping manager and the security manager arrived together, discussed for a while, and dispersed after about ten minutes.

With the cooperation of the hackers, it is likely that the killer left room 1916 while everyone's attention was focused on the location of the fire door opposite.

After the above simulation, everyone agrees that the murderer can theoretically kill people like this, but every link is very tense and far-fetched, and everyone agrees that the real crime process is definitely not what everyone simulates.

Su Cheng had a very clear idea and began to sort it out, and it can be determined that the murderer is a professional, and a professional murderer will not deliberately show off his skills and play with the police, everything he does is meaningful. In that case, why take out the 1 minute and 30 second video. The hacker is very good, he can easily cut out part of the video, and the murderer is very good, and he completes his work in one minute and thirty seconds. To show off your abilities?

No, it has been ruled out by simulation, so there are two answers, the first is that the murderer borrowed part of these resources to complete his own assassination work. Second, the murderer needs to get out.

Especially the second point, Su Cheng heard the big pineapple talk about a case, when a robbery and murder occurred at a gas station on the side of the road in Sweden, after the police investigation of the scene, it was believed that the robbery was the reason for covering up the crime, and the murderer's real purpose was to kill people. Since there was only one highway, the police set up checkpoints, investigated the surveillance checkpoints, and eliminated the suspects one by one, but finally found nothing.

This case is a case in which Big Pineapple intervened when he was a police officer when he was young, because the police collected evidence rigorously, Big Pineapple didn't think that the murderer could get away with it, but the result was that he was at large, so there must be other reasons. The reason for this is that the police were misled, they thought that it was a 30-kilometer uninhabited highway, and the murderer must have come by car, when the fact was probably that the murderer walked across the mountains, spent 10 hours to get to the gas station, and after the killing, spent another 10 hours along the road to leave. Although the big pineapple guessed the means of committing the crime, he did not catch anyone, because there were mountains nearby, and a long time had passed, and the police lacked the conditions to pursue the murderer. This kind of case has become an unsolved case, and because of this, Big Pineapple can't verify whether his speculation is right or wrong.

When there was a similar case prompting his mind, Su Cheng began to check the windows, the living room and bedroom windows were not locked, and when he opened the curtains, he saw a very lonely hotel, and below it was a low-rise building.

Su Cheng said a few words to the manager on duty, and the manager on duty called the day shift and replied to Su Cheng: "The 14th to 30th floors are guest rooms, and room XX16 has a total of three guests staying today, and in the afternoon, only one lady is staying in room 2516, about four o'clock in the afternoon." ”

Su Cheng said: "Zuo Luo, let's go to the main station to see the registration information." ”

Entering the elevator with the manager on duty, Zoro asked, "Got an idea?"

"Yes, because today's visit made the other party murderous to David, the time is very fast, and we will soon know about David's existence. Let's not talk about the details, I'll talk about the idea first, check in at four o'clock, rappel, kill, and then go through the rope to your own position. A series of tactics such as one minute and thirty seconds are created in order to mislead us in the direction of the investigation in a short period of time. Once the time passed, he slipped away. This inference has yet to be added, and this reason is not enough to make the other party suspicious.

Zoro said: "If this is the case, there is a chance that people have already run away. ”

Su Cheng said: "Look at luck, close contact with the service staff at the main desk, fill in the information, register the information, and some traces will be left some." ”

Zoro said: "The ID card must be real, but it will not be me." ”

Su Cheng said: "Agreed." "It's not that you can't register with your real ID card, but it's common sense that suspects who can run away won't use their ID cards.

……

Above room 1916, 20, 21, 22, and 23 were not occupied, 24 was an elderly couple who came to travel abroad, and on the 25th floor was the suspect resident, Song Kai and Fang Ling knocked on the door and opened room 2516, which was already empty, and there was no luggage, and the whole room looked like no one had lived in it.

The main station lady looked at the message: "At four o'clock in the afternoon, a gentleman named Simon booked room No. 16 on the 20th, 21st, 22nd, and 23rd floors, and it will arrive at about eight o'clock in the evening. ”

Su Cheng looked at the information registered in 2516 and dialed the phone number filled in above, there was no accident, it was an empty number. There is surveillance, there is contact with the service staff at the main desk, and there is also the handwriting of the registration, which seems to be targeted. But this will take time, and it will probably take a lot of time, and then the other party can feel free to find an excuse to explain the reason why he will check out immediately, and the police lack strong evidence. In addition, because the deputy never holds the pen, most people's deputies do not write, but draw, and it is difficult to confirm the handwriting due to the lack of writing skills and the transfer of latent habits. Finally, the police have DNA, fingerprint databases, but handwriting libraries are still quite scarce, let alone deputies.

When Su Cheng and Zuo Luo questioned the service staff at the main desk, Fang Ling's mother, Fang's mother, who worked at Interpol, entered the hotel lobby, and Su Cheng and Zuo Luo greeted them politely and sat down on the side.

"Don't say so many polite words, you guys are not in a hurry and you won't let Fang Ling call me directly. Fang's mother took out the computer in her bag, turned on the screen, and introduced: "There is no information about David in Interpol, but I asked a friend from France to help me understand David's situation." David used to be a liar and a thief. ”

"Liars and thieves?"

"Yes, he is a member of a fraud ring, and David has a very strong ability to copy and fake, which is enough to confuse the real with the fake. After his arrest five years ago, he became a connoisseur of art, and his paintings were also very popular, and he is now well-known in Marseille. ”

Su Cheng thought for a while: "What can this ...... mean, it's worth your trip, isn't it good to make a phone call?"

Fang's mother turned on the computer photo: "This oil painting is called red, yellow and blue composition, worth millions of dollars, the oil painting was stolen seven years ago, David first copied four red, yellow and blue compositions, borrowed the stolen news, and their gang sold it to the outside world, each oil painting is two million dollars." Police recovered three fakes. Three months ago, the Red, Yellow and Blue composition was auctioned online at a small auction house in Lyon, and a mystery buyer paid $80 million for the painting. The buyer requested that the auction house not provide auction information to any news media. ”

Fang Mu said: "The auction house sold the real thing, and at that time, the Davids gang admitted that they had stolen the red, yellow and blue composition, but it had been sold to a collector who hired them to steal it for three million dollars, and they didn't know who it was." ”

Wait, there seems to be a contradiction in the law. "It's Europe, not Africa...... Well, is this geographic?

Fang's mother knew what Su Cheng meant, and introduced: "The red, yellow and blue composition was stolen by David's gang from a private collector's home, and the private collector did not insure this oil painting, nor did there be any valid proof to confirm that the red, yellow and blue composition stolen from the private collector was genuine. Although the private collector applied for an injunction, the auction house was able to auction the painting because there was no evidence that it belonged to the private owner. ”

Su Cheng nodded and asked, "The red, yellow and blue composition, the market price is only a few million." ”

Fang Mu said: "Four million dollars is in the sky, after all, he is an artist after World War II." After the auction, the French police investigated the case, but the mystery buyer was from the Middle East, it was difficult to find the information, and the real money of 80 million US dollars arrived. ”

Su Cheng asked, "What about the seller?"

The seller, a young Russian, said that the painting was given to his grandfather by the artist, and what is even more suspicious is that the Russian young man later invested about $70 million, after deducting fees and taxes, in an Argentine company that had been established for less than a week, and the Argentine company collapsed two days later due to investment mistakes. ”

"Haha, this is a blatant money laundering transaction. "Transnational money laundering, come and check, France check, France check, Russia check, Russia check, Argentina check...... People's money has long been gone. Su Cheng said: "The point is still 80 million, and someone wants to give someone 70 million, using some roundabout means." Why? In these days, high-level criminals have all made confidential bank transfers, so why should they pay taxes and a handling fee of 10 million? If it exceeds 10 million, the gannet only charges a 4% handling fee. ”

Zoro asked rhetorically, "Is that the point? The point is what it has to do with David's death." ”

Su Cheng replied: "I can basically deduce a conclusion, David told Hua Zihan the story of this painting, and Hua Zihan asked his parents why they bought this oil painting at a supermarket price, or other reasons. caused Hua Zihan to burn the oil painting very annoyed...... No, it's possible that he didn't burn the paintings. Oil paintings are not easy to ignite, with a little additives...... So the fire alarm was triggered. Hua Zihan is not the number one male in the TV series, so he won't be so saintly, right?"

Zuo Luo said: "No matter what, David died, we can justifiably invite Hua Zihan to the police station as a guest." ”

Su Cheng already had a clear composition in his mind, and according to the calculation of time, 80 million yuan when he bought oil paintings happened to be after the global energy encountered trouble. It can be boldly guessed that Mrs. Hua asked the hanged ghost to contact the ghost abroad for help, and the other party agreed, but it was impossible to post money to help, so how to give money? Art money laundering is currently the most commonly used money laundering method in the world, but it is usually ants moving, such as 200,000, 500,000, not such a high price of 80 million, unless people do not pay attention to the police at all.

Then Hua Zihan had a class reunion, and David found this red, yellow and blue composition, and there were still some questions in it, did David think it was a fake? Or was it genuine? Why did Hua Zihan get angry? Was it because he bought a fake? Or was it some other reason? Could it be that Hua Zihan was very morally noble, and he was angry when he knew that his mother had laundered money? Mrs. Hua: My stupid son, you should do your art.

David knows too much, and it is likely that 80 million things will be involved, so it is common sense that David can no longer live. Now the problem is that I don't know what David and Hua Zihan said. Why was David killed...... Actually, it's not for sure. As a detective, there is an 80% chance that you can make inferences, but this inference is not up to 80%, so meeting Hua Zihan is the most effective method.

Zuo Luo looked at his watch, it was already half past ten in the evening: "I'll go talk to Hua Zihan." ”

"Go now, there is a chance that you will be rejected in the name of resting, etc., I suggest that you gather Hua Zihan and these classmates together in the evening to understand the details of what happened last night. Anyway, they're here for a memorial service, and they don't care about attending more. ”

"......" Zuo Luo didn't bother to pay attention to Su Cheng, called Bai Xue and asked her to contact.

Song Kai sat over, sat next to Su Cheng, and held the computer in his hand: "This is the surveillance video of the guests in room 2516 captured by the hotel surveillance, and the lobby is high-definition surveillance." Technically, I think it's a man, dressed as a woman. Looking at this position, although the hair is all black, there is a color difference, and the edges are unnatural, so it is certain that a wig is worn. Because of women's clothing, it is natural to add false eyelashes, eye shadow, powder and other makeup methods, and it will not be suspected of carrying a large shoulder bag. ”

Su Cheng asked, "Are there any new clues?"

Song Kai said: "She left from the side door of the hotel at 6:30, there is a blind spot in this area, I mobilized all the surveillance that can be found nearby, and no matching person was found within ten minutes...... This is the blueprint, out of the side door, is the staircase flowing water, there are three intersections, turn left, go to the main entrance. Turn right and go to the parking lot. Go straight, the road. ”

"You mean that no suspicious person was found at any of the three intersections?"

"Yes, but there's a hacker on the other side, it's hard to say. ”

Su Cheng nodded slowly: "No wonder they want to delay time, they found out that Zuo Luo and I had already gone to the hotel, so they made some arrangements and killed people." After all, we may directly ask to open the door, once we find David's body and lock down the hotel, we may not have time to run. The other party was a thief, thinking that Zuo Luo and Su Cheng would open the door directly. And Zuo Luo and Su Cheng never thought that David would be killed, and of course they would not open the door directly.

The murderer can be said to have run away, and the murderer in this kind of case is never the most important, they are just a tool. But it's also very important, because without the murderer, you can't point to the mastermind behind it. There is another contradiction, even if you catch the murderer, the murderer may not know who is behind the scenes. Or that gannets are destructive. Money is everything, what? Money can't buy time? Boss, add two bells.