Evidence collection at the site continues. Chen Huanyang, Yu Fan, and Guo Na returned to the bureau first, after all, Yu Fan is not good at on-site investigation, what he is good at is sorting out and analyzing the collected data, finding out some secret logic, and using chemistry and psychology to interpret them.

Back in the conference room, Chen Jianyang found a large scaffolded whiteboard, and Guo Na pasted a map of the town and some clues on the board, so that everyone could analyze it in an all-round way and find inspiration. In Chen's mouth, this method is called a clue wall. The origin of the clue wall is actually the "mosaic investigation wall", which often appears in film and television dramas to nail photos, newspaper clippings and other materials to the wall, and then use lines to connect the data to analyze the data. This type of analysis is based on the Mosaic investigation wall, which is used in financial analysis and intelligence analysis.

Why do you put the clues in this way? In fact, it is also the truth that when we are usually confused, it is not actually how difficult the problem is, but the narrower the angle from which we observe things, and the more we want to solve a problem, we tend to get closer and closer to the problem, because the closer we think, the clearer we can see. But there is a limit to everything, and when you get too close, you only have the problem in your eyes, and the key to solving the problem may be in another room. It's like you're in a labyrinth, going back and forth, and if you blindly run into it at this time, you'll only exhaust yourself. So what should we do? In all words, we should use the perspective of our "heart" - the perspective of God, and when you look down on this labyrinth from above, the route to the exit of the labyrinth will be clear at a glance.

This is an ancient Chinese saying - I don't know the true face of Lushan, only because I am in this mountain.

The clue wall is a tool that can always warn us not to get too close, and to keep a certain distance from the truth.

Yu Fan carefully flipped through the files of the previous fire cases, if it was really the same person, and he had committed the crime so many times without being discovered, it proved that he should be from this town, and he had an identity that was enough to cover up his actions and facilitate the crime. In the first case, the textiles of the workshop were set on fire with cigarette butts; In the second case, a short circuit in the line ignited the warehouse of the food factory where labor protection supplies were stored; In the third, the financial room of the garment factory was set on fire with an alcohol lamp; In the fourth, matches were used to set fire to the waste fabric storage room of the shoe factory; In the fifth case, the designed ignition device was used to set fire to the puffed food warehouse, burned the warehouse keeper, and set fire to the entire department store.

What's the connection? At this moment, Zi Yttrium also came back, still striding meteors, from yesterday to now, it seems that he has not seen Officer Zi Yttrium walking slowly.

"Sure enough, there is a new discovery!" Zi Yan excitedly took a folder and called out to the three of them.

Without waiting for Chen Xiangyang and them to ask, Zi Yttrium, who was anxious, said directly: "Just now our people went to make a record again, and there was a warehouse manager who provided us with new and important clues, this warehouse keeper was on day shift, and the scope of work was the same as that of the deceased, but the working hours were different. He told us that yesterday during the day a man in a maintenance suit came to fix a light bulb in the snack warehouse that was on fire! ”

What an important clue! Chen Jieyang hurriedly asked: "What does it look like?" How old? What are the characteristics? ”

Zi Yttrium: "Wearing a mask, you can't see your face, after all, the air in this town is poor, and they don't have a mask for a special type of work." The storekeeper also exchanged a few words with him at that time, but this person didn't like to talk and didn't take much care of the storekeeper, and the storekeeper thought that this person was quite arrogant at the time, so he was very impressed by this matter. However, judging by the voice, this person is not young, and his body is about 1.7 meters. What's even more strange is that we asked the person in charge of the supermarket again, and they all said that no one had been called to come and repair the light bulb, so it seems that this person who pretended to be a maintenance worker should be very suspicious. “

Chen Jiaoyang scolded fiercely: "It's really deliberate! ”

Zi Yan didn't finish speaking: "Guess what, there are even weirder." The maintenance worker finished repairing the light bulb and offered to help check the warehouse monitoring system and fire protection system, and the warehouse keeper agreed. ”

Guo Na continued: "In that case, if the supermarket's monitoring system broke last night, we don't have to be surprised. The fire fighting system also moved, and last night's fire did not trigger the supermarket's sprinkler system. How did such important information slip out last night? ”

Zi Yttrium: "Because the person who should have been burned to death last night was actually the living warehouse keeper now!" Everyone stared at Zi Yan with wide eyes, and their faces were full of question marks.

Zi Yan explained: "As the warehouse keeper said, he was on duty on the night shift last night, but because of something, he temporarily changed shifts with the deceased last night. When the fire caught fire last night, he was immediately worried about whether his colleague would also have an accident, but he didn't answer more than 20 phone calls, he knew in his heart that the brother who helped him change shifts was more than lucky, and he had been in fear and guilt last night, so when he made a note for the first time, he was in a trance and his brain was blank. Consultant Yu is right, it is indeed more rewarding to take notes during the day. “

Chen Jianyang: "Does this warehouse keeper have any enemies?" Could it be the murder of this living treasurer? ”

Zi Yttrium: "This warehouse keeper has no enemies, and his popularity is also very good, we have confirmed it through the people around him, and the possibility of vendetta has been preliminarily ruled out." ”

Guo Na asked: "Then will this arson case be aimed at the supermarket owner?" ”

Zi Yttrium: "This can't be found out yet, and there are still some records that have not been completed, and they can only be scrutinized when the records are completed." ”

Chen Xiangyang continued: "Well, carefully feel the clues and see if you can find out this little rabbit cub pretending to be a 'maintenance worker'." ”

Zi Yu nodded seriously: "Okay." ”

Chen Jiaoyang turned sideways and said to Fan: "Old Yu, do you think there is anything else to add?" ”

Since just now, Yu Fan has been staring at the clue wall, not participating in the discussion, thinking about something without a glance.

Chen Jiaoyang saw Yu Fan in a daze, leaned over closer, and asked, "Old Yu, why don't you speak?" You've been staring at this board in a daze since just now, what do you think? Did you find the motive for the arsonist to burn down the supermarket? ”

Yu Fan exhaled deeply, turned around slowly, exchanged glances with everyone present, and then lowered his eyes and thought for a moment. Yu Fan's face was gloomy, and he said in a heavy tone:

"It's not this supermarket he's going to burn, it's the whole town!"