Chapter 16 Section 4

"It's chlorine gas. A plastic container and a broken balloon were found in the paper bag that caused the accident. The container contained sodium hypochlorite, and the balloon was most likely filled with sulfuric acid. When the two are mixed together, a chemical reaction will occur and produce gas. Find something in common with the subway gas incident." Mukai's voice echoed in the conference room.He is small and thin, wearing a crisp suit, and looks more like an employee of a first-class company.Except, of course, the sharp eyes. Mukai was holding a report from the Metropolitan Police Department's Scientific Research Institute in his hand, which was the result of an analysis of the paper bags left by the perpetrators in the foul smell incident in Ginza Hanaya yesterday.

Hearing that it was chlorine gas, Kato Wataru pursed his lips and smiled.No wonder no one from the Ministry of Public Security showed up today.This information must have also been sent to the investigation headquarters of the subway poison gas incident.Since it has nothing to do with poisonous gas, those people definitely don't care now.I heard that there was a poison gas incident in Ginza. Those people rushed to the scene first, investigated the situation with the victimized shop assistants, and seized the initiative without authorization. How is it now... Mukai led investigators headed by Kato to Tsukiji East Police Station, where the investigation headquarters was temporarily set up.It's temporary, because the investigation of the poisonous gas is now the responsibility of the Metropolitan Police Department.

As yesterday, investigations are still being carried out around the scene today.The gains are minimal.The only distinguishing feature is Hanaya's paper bag, but holding one in Ginza will never make any impression. The only clue so far is the two surveillance cameras located on the third floor of Huawu.More than a hundred people passed by where the paper bags were placed.The video did not capture the feet, and it was impossible to determine who placed the paper bag.Investigators are describing the facial features of everyone in the video, listing them, and comparing them with previous surveillance videos.It was assumed that the perpetrator would have previewed the terrain.

"What needs to be emphasized is the modus operandi of mixing two drugs together." Mukai continued, "The report states that a rubber balloon filled with sulfuric acid was placed in a container filled with sodium hypochlorite, and it was set in advance. A stimulus will burst." "What's the stimulus?" asked a policeman. "The setting is that as long as you move the paper bag, the switch will be turned on, and the needle will pierce the balloon with an electromagnet. You can read the copy of the report for details." After reading the copy passed over, Kato felt admiration from the bottom of his heart.The structure of the device and the switch that relies on the electromagnet to make the needle fly out is not too complicated.The switch uses a steel ball in a pinball game. As long as the paper bag is moved, the steel ball will roll on the track. The moment it hits an obstacle, the current will flow from the dry battery to the electromagnet.It is estimated that even elementary school students can do it.

"Steel ball..." Kato said to himself. "The pachinko room is currently locked, and it is estimated that it will be found out soon." Mukai said, "As for the plastic container and balloon, the manufacturer is also being investigated. The electromagnet is estimated to be a part of what it is. The details of the needle and other parts are unknown. Regarding the gas generated devices, that’s all.” "I don't know anything." Someone muttered. Mukai glanced in the direction of the sound. "It's not without inspiration. As stated in the report, the setup is extremely simple, and anyone who has the knowledge of a middle school student can make it. Including you, as long as you look at the sketch above, you should be able to understand the structure immediately. But can you imagine Coming up with that approach is key.”

After hearing what the team leader said, everyone fell silent.Kato also deeply agrees in his heart.When a person becomes an adult, as long as he does not use it in work or hobbies, he will definitely forget the principles of electromagnets and electric currents. "There is another problem. Although the principle is simple, if you want it to function, whether it is a switch using a steel ball or an electromagnet, you need to meet the appropriate conditions. If you make it without thinking, it will definitely not work properly. The device in this case is quite clever. The Scientific Research Institute believes that the perpetrator is either a professional manufacturer, or has undergone repeated research and development."

"No doubt it was done by a handy man." Hearing Kato's opinion, Mukai said: "I feel the same." Then he said loudly: "Although I don't know how the Ministry of Public Security understands it, I never thought of linking this case with the poisonous gas in the subway. The nature of the terrorist act targeting the place is completely different from the case targeting the jewelry store. This is the unanimous opinion of all members of the criminal department. First, we must thoroughly investigate the peripheral situation of the relevant personnel in Huawu.” "What if it is found to be related to the poison gas incident?" Kato asked tentatively.

"At that time," Mukai paused for a moment, with half of his cheeks slightly relaxed, "we will talk about it at that time. We will conduct investigations according to normal procedures. If we need to obtain information from the Ministry of Public Security, we must find ways to get it out. But as long as they don't ask, we don't have to ask They report." "Okay." Kato also smiled slightly. Kato attaches great importance to the mysterious person mentioned by the shopgirls who has been haunting them recently.Although chlorine gas is dangerous, it is not fatal. It is estimated that the purpose of the perpetrator is to frighten someone in the Chinese house.This insidious approach fit perfectly with the image of the mysterious figure they spoke of.When investigating the situation, because the word "pervert" came out of his mouth, those from the Ministry of Public Security who expected to be related to the subway poison gas incident even gave him a face.

In short, the relevant personnel of Huawu, especially the shop assistants, should be investigated one by one.Just as Kato was discussing with his colleagues how to carry out their work, they suddenly received a notice that two female shop assistants from Huawu had come to the police station, as if they had something to say. Kato decides to meet them with his young colleague Nishizaki, who also belongs to the Mukai group. In the reception room in the corner of the criminal department, two women were waiting.Kato has impressions of them all.Both of them are beauties, and one of them is particularly eye-catching, and he can be an actor.Kato can remember that her name is Xin Haimei Fuyu, not just because her name is not common.

Xin Haimeifuyu was only accompanying this time, the protagonist was the clerk named Hatayama Akiko, who claimed that there was one thing that he did not say during the investigation yesterday. "What is it?" Kato asked with a smile. As soon as he saw the note that Hatayama Akiko took out from the bag, Kato's smile disappeared without a trace.It could even be said to be the foreshadowing of this crime. "When did you receive it?" Kato asked. "It happened two days ago. When I got home from get off work, I found it stuck on the door." "It says 'How dare you betray me', what does it mean? Could it be that you betrayed the mysterious man?"

"He seems to think so." Hatayama Akiko nodded. "What's the meaning?" Xin Haimeifuyu said: "I once suggested to Hatayama that she pretend to have a boyfriend. For example, hang men's clothes, change the house number to a man's name, or mix men's products in the trash." "Oh. You did it?" Kato turned his gaze to Zhang Zi. "I mixed men's stuff in the trash, and when I hung the laundry..." "When did it start?" "It should have been a week ago." "As of today, besides this note, are there any other abnormalities?" After Zhang Zi thought for a while, he shook his head slightly. "Nothing special. I didn't receive any strange letters or phone calls. I thought Xinhai's suggestion worked..." Kato folded his arms, and his eyes fell on the note again. The part "How dare you betray me" can be explained as follows: the mysterious man seems to think that Zhang Zi has a boyfriend.Because this kind of person is too obsessed with the target woman, he always thinks that she belongs to him.Kato knew quite a few of the murders that had grown out of it. "Your life is in my hands, and I will let you know it." These words reflect that this person's mental state is very dangerous.The anxiety of not achieving his goal and the anger of being betrayed by his loved ones make him likely to explode at any time. But Kato thought, from this sentence, he couldn't feel the killing intent of being forced to the end.All he wanted to say was "it can kill you at any time", it was just a warning, and from the perspective of warning, the method of releasing chlorine gas did work. What does the phrase "I am always by your side" mean?Is it just to show that I know all about Akiko Hatayama's actions, or does he have other intentions? "Is there anything unusual after the incident?" Kato asked Akiko. "I got a call last night." "Say what?" "'Got it now. Don't betray me'. Then hung up. I was terrified, so..." "Come here today." Zhang Zi nodded vigorously. Back at the headquarters, Kato immediately reported to Mukai.Mukai looked at the note and said in a low voice, "Does the media know about this?" "It didn't leak out, and I told them not to say it." Mukai nodded. "Do you want to send someone to monitor Akiko Hatayama? But the other female employees are also harassed by that mysterious man to varying degrees." "That's what I can't figure out. If the man who fell in love with Akiko Hatayama started the case because of love and hatred, why did he harass other women? Is it some kind of cover-up?" "Hide what?" "I don't know." "Could it be that he was interested in all the female shop assistants in Huawu at first, and then concentrated on Akiko Hatayama?" "It's possible." Kato's tone added unacceptable elements. "I'm by your side all the time... This sentence is memorable." Mukai seemed to feel the same way as Kato. "Is it just intimidation, or does it have substantive significance? That needs attention." "Substantial meaning?" Mukai looked up at Kato, with an expression that seemed to expect his subordinates to say the same thoughts as him. "The culprit is inside, or by their side. But if that's the case, wouldn't it be written like this instead? This is another question. Maybe he underestimated Akiko Hatayama and thought she would not call the police." Mukai seemed lost in thought and closed his eyes. "There are five female shop assistants... for the time being, monitor their commute and commute."