Women only affect the speed of my reasoning!

"Okay, let's end the small talk. Since you have changed your mind and are willing to leave, I will not play those little tricks and go straight to the main course."

The voice on the other end of the phone stopped laughing and seemed to suddenly become impatient.

"Listen, I have placed five bombs on the Chiba Circular Line. The bombs will start after four o'clock this afternoon. As long as the train speed on the circular line is less than [-] kilometers, the bomb will explode. And, if If the bomb is not defused before the sun sets, the bomb will also explode."

Sixty kilometers…the sun goes down…

"It's four o'clock in the afternoon, it's still very early." Qin Sanshu pondered slightly, "Is that just that?"

"Yes, it's just that, I'll give you enough time." The voice on the other end of the phone paused, "But after all, this is just the first level. I can make an exception and provide a hint. The location of the bomb is at 'XX of X'. Each X represents a word, and you need to think about it yourself as to what these words are."

Qin Xianshu said lightly: "So can I go and defuse the bomb now? I have other things to do in the afternoon. I need to finish it as soon as possible."

"Of course, you can start now, detective." The prisoner's voice paused again, "But I think you won't be able to do what you want to do this afternoon."

"Oh, that's right..." Qin Ushu smiled noncommittally.

"Then, may your military fortune be prosperous."

The call was hung up at this point.

Qin Ushu put down his cell phone, picked up the sandwich and took a bite. Mitaka Jin across the table had an inexplicably subtle look on his face.

"Although I did it on purpose, I just heard someone on the phone saying they were going to bomb Sakurasou..."

"Not only that, he probably also placed five plastic bombs controlled by photosensitive sensors on the tracks of the Chiba Circular Line." Qin Uanshu said vaguely.

"Eh?" Mitaka Jin was startled, then looked shocked, "Wait a minute, have you solved the puzzle yet?"

"Pretty much, if I'm right."

After swallowing the remaining small plate of sandwich in one gulp, Qin Ushu drank the coffee in the cup and stood up from the table, carrying the empty plate and empty cup to the kitchen.

"By the way, remember to tell Doragon for me later and ask him to connect the signals of all the cameras near Sakura Manor to avoid being robbed."

"Oh……"

Mitaka Jin was about to nod in agreement. At this moment, the screen of Qin Ushu's mobile phone on the table suddenly lit up, and the Q-version girl Doujiang appeared on the screen.

"No need to worry, Mr. Ryunosuke has connected all the cameras within a half kilometer radius of Sakurasou to the local server. Mei Doujiang is responsible for real-time monitoring. Once there is a suspicious person, he will be tracked and monitored immediately!"

"It's really reliable."

Qin Sanshu smiled and put the dishes to be washed in the sink. He walked out of the kitchen, picked up his phone and walked towards the entrance.

"Then I'm off."

"Wait a minute." Mitaka Jin stopped him, "Aren't you going to say something to Shiina and Fujimine?"

"Well..." Qin Xianshu was silent for a moment, "Don't worry, I will explain it to them after I finish everything."

"That's it."

Mitaka Jin stopped talking.

After changing her shoes and leaving Sakura Manor, Qin Sanshu immediately made a phone call and left.

On the other side, in the Metropolitan Police Department, the loud voice of the Megu Police Department resounded throughout the entire Search Division [-] office.

"What? Brother Usamashu, you said that the criminal who stole the Toyo Arsenal contacted you? And he also threatened to plant a bomb on the Chiba Ring Line?"

Hearing the sound, Sato Miwako, who was sitting not far from Megure's desk, immediately stood up.

Their eyes met, and Megure Police Department nodded slightly in greeting. After receiving the order, Sato Miwako picked up the police car keys and turned around and walked out of the office.

"I understand. I'm going to mobilize the bomb disposal team right now. They'll be there in about 15 minutes. We'll meet at the main road intersection near your residential area later."

……

Fifteen minutes is not a long time. In fact, seven or eight minutes after Qin Sanshu walked to the intersection of the main road in the residential area and found a shade tree to stop, five or six police cars lined up in a long line with their lights flashing and turned around not far away. Coming.

The leading police car stopped in front of him, and the front window was rolled down. Miwako Sato was in charge of driving, and the police officer in the passenger seat looked serious.

Qin Sanshu opened the back seat door and got into the car. He got in and closed the door. He took out his mobile phone and played the recording he had recorded with the prisoner before for them to listen to.

The recording lasted less than 2 minutes in total. By the time the playback ended, the atmosphere in the small car space was solemn.

The Mumu Police Department was the first to speak: "Brother Ushu, do you have any clues about the 'XX of X' mentioned by the prisoner?"

"I think it should be on the railway track, and the start and stop of the bomb should be controlled by a light-sensitive sensor."

Qin Xianshu said bluntly.

"There are three reasons."

"First, if you want to blow up a train, you must install the bomb on the train or somewhere the train will pass. In terms of technical difficulty, it is almost impossible to bring the bomb onto the train because the train There is a security check in the station. As for installing it at the bottom of the train, it is even more nonsense. Unless the prisoner has a way to install the bomb from the outside to the bottom of the train while the train is traveling at high speed, the most likely place to install the bomb is where the train must pass. .”

"Second, the bomb triggering mechanism mentioned by the prisoner will explode after four o'clock when the driving speed is less than [-] kilometers. Then the problem arises. According to the prisoner, he has now installed all five bombs, but How can he know the real-time speed of each train?"

"Besides, based on common sense, I don't think there can be only five trains running on a circular line, right?"

"And the third point is that the bomb will explode once the sun goes down. This is the most powerful evidence to prove that the prisoner installed the bomb controlled by the photosensitive sensor on the railway track. After all, there are still street lights along the ring line after the sun goes down. Lighting, but the light intensity is certainly not as strong as direct sunlight.”

"That's the case, but is it possible that the detonation of the bomb was actively operated by the prisoner, for example, by pressing the detonation button directly after the sun went down?" Miwako Sato asked.

Qin Xianshu shook his head: "That's even more impossible. If it is to be actively operated, just measuring the speed of a single train will be a big problem, let alone measuring the speed of multiple cars at the same time."

As Qin Xianshu analyzed it step by step, the frown of the police department gradually relaxed.

He took out the walkie-talkie on his belt and connected everyone.

"Everyone listens to the order and immediately goes to the Chiba Circular Line, focusing on checking every railway track. If any object suspected of being a bomb is found, report it immediately!"

Chapter 182 The policewoman is disconnected and reconnecting

A circular line, as its name implies, the track of the entire line is a closed loop in which trains can travel over and over again.

But no matter how closed-loop the design is, there will still be a depot, which is where all trains are parked for maintenance and repair, and where the central signal control building is located.

About half an hour later, a police car drove into the Chiba Circular Line depot.

Upon learning of the arrival of the police, the person in charge of the depot quickly met with the Memu Police Department and others in the conference room. He was shocked when he learned the purpose of his visit.

"Wha...what!? A bomb was planted on the ring line?"

"That's what happened."

Beside the conference table, the Mumu Police Department nodded calmly.

"However, we have now learned that the location where the prisoner planted the bomb is likely to be between the railway tracks, so if possible, we hope that your depot can cooperate with the investigation."

"...I understand." The general person in charge had risen from the grassroots level after all, and was not a straw bag appointed to be airborne. After experiencing the initial shock, he quickly calmed down.

He picked up his mobile phone and dialed: "It's me, listen up. A bomb has been installed by criminals on our ring line. The signal control center will immediately release the entrance to the track maintenance line to allow the police bomb disposal team to enter. It's safe." As for protective gear..."

The person in charge looked at Memu for advice.

"We have these ourselves." Mumu replied.

"Okay." The person in charge nodded, and then said to the phone, "No safety gear is needed, just open the entrance directly."

After the call ended, Miwako Sato hurried in outside the conference room holding a large box and placed it on the conference table.

"What is this?" Qin Xianshu looked at the big box curiously.

"Inside are instruments that can track call signals."

Miwako Sato opened the box and took out a laptop, a bunch of miscellaneous data cables, power cables, and other instruments.

She connected all the instruments, and finally pulled out a type-c data cable that looked like a normal mobile phone charging cable and handed it to Qin Uanshu.

"Connect this to the mobile phone. Since the prisoner said this is the first level, there will probably be a second level or even a third level and a fourth level in the future. If the prisoner calls again next time, this instrument can be received through the mobile phone. signal to track the prisoner’s location.”

"Oh, high technology!" Qin Xianshu said in admiration.

"When I came out of the Metropolitan Police Department, I thought I might need it, so I took it with me."

Noticing the confused look cast by her superior, Sato Miwako smiled and explained, and then she sat down next to Qin Ushu.

The person in charge sitting on the main seat still looked worried: "But...the inference is just an inference in the end. The ring line surrounds Chiba. It will take at least half a day to completely search it. But if the prisoner really What to do if a bomb is brought to the train, it will be too late to search them one by one."

"That's impossible." Qin Xianshu glanced at him, "Unless your company's security inspection system is so backward that it cannot even detect explosives."

"It's not a problem with the security inspection system..." the general manager sighed softly, "Although from my personal standpoint I'm not willing to doubt it, I still can't rule out the possibility of an internal employee's case. After all, if it's through the internal employee channel , you can reach the platform directly from the station concourse without going through the security gates and turnstiles.”

"In that case, there's nothing we can do. It's hard to guard against a domestic thief." Qin Uanshu shrugged honestly and said, "But even if that happens, we still have the last and most conservative method to use. "

"what?"

"The first step is to evacuate all passengers on the grounds that maintenance is required on the railway."

"The second step is to drive all trains back to the depot."

"The third step is to wait quietly for the sun to set."

As the high school detective listed the three steps in sequence, Sato Miwako's expression seemed to have some understanding.

"Waiting to explode?"

"Waiting to explode."

Qin Xianshu repeated it calmly.

"In that case, the company will inevitably suffer heavy losses..." The general manager sighed melancholy, "But there is nothing we can do about it. If things really come to that point, in order to protect everyone's lives, this is the only way to do it. ”

"really."

After saying these words, the conference room fell completely silent.

The waiting time was quite long, and the time passed by minute by second. From morning to noon, no progress report message came through the intercom.

Their lunch was finally brought to them from the depot staff restaurant, and the four of them gathered around a mobile phone and a lot of instruments in the conference room, eating and waiting for news.

Qin Sanshu had just scooped a spoonful of barbecue rice into his mouth, when the phone suddenly rang.

Almost instantly, everyone around the table focused their attention on the sound.

However, what is somewhat unexpected is that what appears on the caller ID is not the familiar "Unknown Caller", but the three characters "Yukiko".

"what……"

Qin Xianshu reacted immediately, waved his hand to signal others to calm down, and then picked up his cell phone to connect under the slightly wary gaze of the policewoman beside him.

"Hello? Are you awake?"

"Ok!"

The girl's familiar voice came from the phone, and she hummed straightforwardly, with obvious dissatisfaction.

"So what about you? Where have you gone?"

"I... have something to do outside now." Qin Ushu paused.

"Is something wrong?" Yukiko said in a more serious tone, "You must have gone to that afternoon tea party, right? Didn't you say you didn't want to go?"

"It's not an afternoon tea party." Qin Sanshu explained helplessly, "There is an emergency at the moment, so..."

"What about the date?"

The girl's tone became even more dissatisfied.

It's not that Yukiko is ignorant, after all, everyone will feel unhappy after knowing that they are likely to be let go.

"I haven't forgotten." Qin Xianshu's answer did not disappoint her, "If I haven't come back by then, you can go there first. I will come over on time after I finish handling it."

"Well, all right."

Hearing this, Yukiko on the other end of the phone was slightly stunned, but she still didn't forget her instructions.

"Don't forget, at six o'clock in the evening, Chiba City Center Commercial Plaza."

"remembered."

After confirming that there was nothing more to say, Qin Xianshu hung up the phone.

He put down his cell phone and was about to continue eating, but as soon as he turned around, he saw Miwako Sato staring directly at him.

Inexplicably, Qin Xianshu felt as if a wisp of chill rushed up his back.

"What's wrong, Miwako-san?"

"nothing."

Miwako Sato was still smiling.

"Have you made a date with your girlfriend tonight?"