Police officer Xiao Zhang: "On that day, there were four of us, Zhang, Li, Zhao, and Xiao Guo. Responsible for tracking this suspect, for three days in a row, we almost never left, he has not left our sight, he buys groceries, goes to the supermarket, walks, we all follow, and it is the three of us to complete the mobile tracking task, Guo Na did not participate, because we are professionally trained after all, and Guo Na is easy to expose. We try to be as careful as possible, so I'm sure he won't be able to detect us. ”

Yu Fan asked again: "Is there anything unusual in this process?" He walked back and forth repeatedly? Sudden acceleration of running? Or is there something that makes you feel like your tracking might be exposed? ”

Xiao Li also spoke: "There's nothing unusual, he didn't even stop looking back, he shouldn't have noticed us." ”

Yu Fan: "Where is the last place to disappear?" ”

Xiao Zhao: "In his house." ”

Yu Fan was surprised: "Oh? Did you find his house? Yu Fan said, and swept to the desk in the office There was a bag of potato chips, so he dismantled the potato chips and distributed the potato chips to everyone, and everyone continued to chat while eating potato chips.

Xiao Zhao: "Yes, his house is an ordinary family area, there is no elevator, a total of 7 floors, the suspect's home is on the fifth floor, there are two households on one floor, just a door exit, in fact, it is very easy to track, after the suspect went upstairs, we also installed surveillance at his door." Just waiting for Weng Zhong to catch the turtle. ”

While speaking, Xiao Zhao's eyes were full of hope, after following for so many days, he finally saw the hope of capture, as if a group of hunters had forced an injured wild deer into a corner, just waiting for the wild deer to release the last bit of solution on his body, and finally captured.

Yu Fan: "What's next?" It's gone? ”

Guo Na spoke: "Our car was parked downstairs, taking turns to keep an eye on it, and the whole process recorded the people who entered and exited this building, and he never came out for three whole days." ”

Yu Fan asked again: "What about eating?" Takeaway? ”

Guo Na: "Well, takeout, we have ordered takeout these days, usually one meal at noon, one meal at 6 o'clock in the afternoon, and one supper in the middle of the night, which makes us all hungry." ”

Chen Jiaoyang knocked on the table: "Give me a little serious." ”

Guo Na stuck out his tongue again and was embarrassed: "Then on the fourth day, there was no takeaway, but the lights in the morning and evening were turned on and off, and on the fifth day, we felt a little wrong, but we went up and knocked on the door, but there was no response, we broke down the door, and there was no one in the house, I was pretty sure he didn't come out of the window, because I kept staring at the window below." ”

Yu Fan dragged his chin with one hand: "The world is evaporating? Interesting, can I take a look at your surveillance video? “

Chen Frameyang: "Of course you can, in fact, I haven't watched the video a few times, because the time is too tight, so I just called you here, and now every second passes, the more disadvantageous we are." ”

I thought I could catch a turtle in an urn, but I didn't expect this turtle to be a turtle that could burrow in the ground. People are often like this, those who drown will be useful, those who mess up are always sure of something, the wind and waves are easy to pass, but the gutter is the easiest to capsize.

Yu Fan nodded, while handing out potato chips to everyone, it is said that snacks can relieve people's nervousness.

The macro envoy in the video is a dwarf about 1.5 meters tall, in a northern city like XA City, this kind of dwarf is rare, and it stands to reason that it is easier to recognize and easy to track. Yu Fan took a closer look at the surveillance, held his chin and lowered his head in contemplation.

Sometimes, the most conspicuous is the least visible.

Yu Fan suddenly showed a smile on the corner of his mouth: "I know how he disappeared." ”

Everyone was amazed, how did you know so quickly?

Chen Jieyang also quipped: "Old Yu, don't jump to conclusions, but I still want to hear your thoughts." ”

Yu Fan pointed to the surveillance: "You see, every time he orders takeout, he opens the door in advance, and then the takeaway brother comes, knocks directly on the open door, and then has a few words with the inside, I guess the general content should be 'You come in, put the food on the table for me', from beginning to end, the suspect did not show up." ”

Yu Fan paused, glanced at the surprised crowd, and continued: "But don't you think it's strange? When we usually order takeout, shouldn't we all wait for the takeout to come and knock on the door before opening the door? How could you open the door in advance? In the winter, it is so cold to open the door, and he lives alone, and he himself is a weak person, usually open the door, what if a bad person comes in, although he himself is a bad person. Then, on the third day, his accomplice came in disguise as a delivery boy, entered the door in the same way, and then put him in a delivery box and took him away. The reason why you saw a light switch on the fourth day was that it should be remote control, and now this kind of smart lights are everywhere, which is already a delaying measure. The reason why there were no takeaways on the fourth day was because there were no more people who could open the door on the fourth day. ”

Everyone was dumbfounded, such an explanation seemed to work, Chen Jieyang asked Yu Fan: "Old Yu, such a big living person, can the takeaway box fit?" ”

Yu Fan: "The general takeaway box is already 50cmX37cmX37cm in size, and he only needs to choose a slightly larger takeaway box, which can fully hold a person of 1.5 meters." And it's hard to detect. ”

Guo Na also scratched his head in confusion, tried to recall, and said: "I think it's a little strange to say this, why did they go into the house to deliver takeaways, but why did we ignore this detail later, this is a mistake." ”

Yu Fan: "Actually, you all know the law of material exchange, change brings the exchange of matter or energy, and grasping the variable is the key to cracking the code. Casually let an outsider look at this evidence, and it is easy to put the suspicion on the little brother who delivers food. Merely... ”

Chen Xiangyang couldn't wait: "It's just what?" Old Yu, don't sell it. ”

Yu Fan said calmly: "You are not outsiders, or rather, you were forcibly pulled into the game by your opponent. ”

Guo Na's eyes flickered, puzzled: "What do you mean?" ”

A smile appeared at the corner of Yu Fan's mouth: "You answer me a question first, did you swallow all the chewing gum I gave you just now?" “

Everyone was taken aback, confused by Yu Fan's nonsensical question, and their thoughts jumped out of the case, everyone had eaten Yu Fan's chewing gum just now, but everyone searched around their mouths with their tongues, and they were surprised to find that the chewing gum in their mouths was gone!!