"This murderer is smart, patient, and determined. Zou Cheng said.

"The robbers of the gold shop will study the situation of the gold shop so that it is convenient for them to go in and get the gold and money before leaving. ”

"He had a clear goal, which was gold and money. ”

Hearing Zou Cheng's words, Liang Ying cried and said, "But it seems that this murderer didn't have it?"

Zou Cheng shook his head and said, "No, he does, and our prisoners also have a clear goal, but we don't know it yet." ”

"But when we figure out what that goal is, we're one step closer to catching him. ”

Hearing Zou Cheng say this, Liang Ying felt that she couldn't do nothing.

She said: "Inspector Zou, can we apply to take the things in the roller coaster control room away, I want to go back and study it." ”

Zou Cheng talked to the people in the amusement park about this problem, and they wished that Zou Cheng would take it away, and then research a result.

Otherwise, their amusement park can only be closed like this every day, and such losses will be too serious.

After that, someone brought the computer in the control room, and then helped Zou Cheng transport it to the office.

After returning to the office, Zou Cheng saw that there were also a lot of things piled up in the office, and Zhu Ting was directing those people to install them.

Seeing Zou Cheng and Liang Ying crying back, Zhu Ting said, "You guys are back, how do you get these things?"

Zou Cheng said to Liang Ying: "You go to study the things you brought back, and I will be in charge of here." ”

It's not Zou Cheng who installs anything, but someone who installs it, and Zou Cheng only needs to command and tell them how to install it.

Liang Ying went down with the things to study those things.

Zhu Ting asked Zou Cheng, "You went to Fangtian Amusement Park?"

"Don't think about it, it's not to play, it's to encounter a case. Zou Cheng said.

"What case?" asked Zhu Ting.

"Why don't you go to do your homework and ask about the case?" Zou Cheng said to Zhu Ting, while directing those people to install the things.

"I'd have finished writing it a long time ago, otherwise I wouldn't have had time here to do these things. Zhu Ting said proudly.

Seeing that Zhu Ting was curious, Zou Cheng roughly explained the matter to Zhu Ting, and Zhu Ting seemed to understand it.

In terms of computer networks, Zhu Ting really doesn't know much about it.

The level of the installation master is good, and it was installed quickly.

One of the walls in the office has now become an LCD screen piece by piece, Zhu Ting looked at this wall and said, "It should be good to watch a movie." ”

"You can watch it when you're bored. Zou Cheng said with a smile.

After everything was done, he sent away the installation masters, and Zou Cheng went to see Liang Ying.

"Did you find anything?" Zou Cheng asked Liang Ying.

Liang Yingqi held something in her hand and said to Zou Cheng: "A Bluetooth transmitter was found. ”

"Bluetooth? Isn't this machine completely physically isolated without Bluetooth?" After Zou Cheng finished speaking, he said, "The murderer put it?"

Liang Ying nodded and said, "As far as it seems now, it is undoubtedly the murderer." ”

"It's a single-board computer, very rudimentary. Liang Ying said.

Looking at Liang Ying's hand, such a small thing, Zou Cheng said, "You said this thing is a computer?"

"A single-board computer, to be exact, looks rudimentary, but it's very powerful, and more importantly, it's not part of a roller coaster controller. Liang Ying said to Zou Cheng.

Zhu Ting also ran in, didn't disturb Zou Cheng and Liang Ying, and stood behind Zou Cheng.

"The murderer put it in. Zou Cheng had already said this just now.

"The killer secretly put a fake panel into a programmable logic controller. Then he placed it next to the six panels that were already inside. Liang Yingqi showed Zou Cheng a demonstration, and Zou Cheng already understood.

Zou Cheng said: "No one cares about this panel, because everyone thinks that it is here in the first place, and they will not take it out to see it." ”

"Yes, when I first saw this machine, I also didn't notice the inside of the panels, I thought this machine was seven panels, and I opened it just now and found that it wasn't at all. Liang Yingqi was also confused, and she should have thought that that thing should be there.

Although the people in the amusement park know that it should be six, who will pay attention to it, it is originally a place to put panels, and if there is one more, who will pay attention?

No one will notice, so when it comes to inspection, no one will check it out.

Liang Yingqi continued: "The extra panel is exactly the same as the other six, so the prisoner can blatantly hide the seventh panel inside, because no one will think to look for it. ”

"I don't really understand. Zhu Ting said in the back.

Hearing Zhu Ting's words, Liang Yingqi picked up her mobile phone and said: "I installed a single-board computer, I use my mobile phone to control it through those hidden circuit boards, and now I can control all the lighting systems in the office." ”

"Really, fake?" Zhu Ting thought it was amazing.

Zhu Ting snatched Liang Ying's mobile phone, then clicked on it, and found that the lights in the office were really turned off, and then she could also choose to turn off a certain light.

"So amazing?" said Zhu Ting.

Liang Ying said to Zou Cheng with some embarrassment: "I just want to test it and see if it is feasible." ”

"It's fine. In order to solve the case, Zou Cheng felt that there was nothing to do with this.

And with this control, it will be convenient to turn off the lights in the future, Xi Chen said to Liang Ying: "Get one on my mobile phone later." ”

"Okay. Liang Ying nodded.

"So you mean to say that the murderer used this thing, and then used his mobile phone to control it?" Zou Cheng asked.

"It's a possibility. Liang Ying said.

"Not bad. Zou Cheng felt that Liang Yingqi could find this, which was already very good, and the case had progressed.

But Liang Yingcries are not optimistic, Liang Yingcries said: "This kind of single-board computer can be bought for a few hundred yuan, and it can be bought everywhere on the Internet." ”

"And what's even more exaggerated is that I searched on the Internet, and the store not only sells you things, but also comes with instructions and tutorials to teach you how to use them. ”

"What happened just now?" asked Zou Cheng.

Liang Ying nodded and said, "Yes." ”

Zhu Ting said: "But destroying a roller coaster is much more difficult than controlling the lights." ”

"Actually, it's not, the coding is very similar, it's as simple as a nine-year-old child, and the PLC can control almost everything you can think of. Liang Ying shook her head and denied Zhu Ting's words.

Hearing Liang Ying's words, Zou Cheng said: "So in this way, the scope of our murderers has expanded from people who are proficient in programming networks to everyone. ”

Liang Ying nodded and said, "Yes, this kind of thing looks difficult, but if there is a tutorial, Zhu Ting will be able to do it in one night." ”

"With just such a single-board computer, everyone can hack and control the PLC, if everyone can do it, then how can we find the prisoner?" Zhu Ting didn't understand, if just one person could do it, then the range was really too big.

Zou Cheng was not so frustrated, he analyzed it and said: "That is to say, when the accident occurred, the prisoner was not in the control room. ”

"He's only been in the control room once, and that's to put the circuit board, and then he's just like you do with the lights, and he uses a Bluetooth transmitter plugged into the circuit board, connected to his phone, and causes the roller coaster to crash. Zou Cheng said to Liang Ying.

Liang Ying cried and said, "It should be." ”

"This board is the murder weapon and our decisive evidence. Zou Cheng said.

"Didn't you say that the computers in the amusement park have no way to connect to the Internet?" Zhu Ting asked Liang Ying.

Liang Yingqi knew that Zhu Ting didn't understand these things, and continued to explain: "But plugging it into the circuit board of the computer can, and the Bluetooth transmitter on the circuit board can be paired with any device within eighteen meters that knows its address. ”

"Eighteen meters, I see, so the murderer must be a mobile phone, not a computer. Zhu Ting immediately said.

Zou Cheng nodded and said, "Yes, you are right. ”

"And we now have one more clue. Zou Cheng said.

"What clues?" asked Zhu Ting and Liang Ying in unison.

Zou Cheng said: "Because the distance is only 18 meters, when an accident occurs, the murderer is in the crowd at the scene, within 18 meters, which shows that the murderer likes to go out in person and commit crimes at close range." ”

"A voyeur with a quirk, who causes accidents for self-gratification, a pervert, the excitement is blood, or so-called gore. ”

So his goal was to see the accident with his own eyes, and to document it and share it with a bunch of people who were excited about it. ”

Hearing Zou Cheng's analysis, Zhu Ting and Liang Ying were stunned.

They said, "Is there anyone else like that?"

"There are all kinds of people. "Since Zou Cheng solved the case, he has seen a lot of people, and there are really all kinds of people.

It sounds incredible, but there really are people like this, and the world is so big.

"Is the only goal of this accident to be massacre?" they still didn't understand.

Zou Cheng shook his head, he didn't answer the question, but said: "Before there were computers, pedophiles would hide a box of photos under their beds, and due to geographical limitations, pedophiles had no way to communicate, which forced them to suppress their desire to not be recognized by society. ”

"But now there's the internet, and the internet connects people with the same quirks, and when they come together, they normalize that behavior and even encourage each other. ”

"So Inspector Zou, do you think the nature of this incident is the same?" Liang Ying asked.

"Obviously, a lot of features show all this," Zou said. ”

"Crashing a roller coaster, it's a big event, it shows that the killer wants to impress others, there is one person killed in this case, but dozens of people could have died, and that's what the killer wants to see. ”

"The bloodier, the better, and I'm sure the target should be in a quirk community, a forum that encourages violent impulses. ”