The crime rate is low, but the number of missing people is about 85,000 each year.

This is an official statistic, and the actual number of missing people should be much higher based on the capacity and efficiency of the police, but it is difficult to determine how many have disappeared.

Two missing people were killed today, one in the morning and one in the afternoon.

The Hirano General Police Station is no one sleeping tonight, the whole building is brightly lit, and there are constantly police cars flashing in and out in red and blue, and the search headquarters has been established, gathering all the elite soldiers and strong generals of the Hirano Search Division, vowing to find out the prisoners before they are scolded as pigs' heads.

This is not the same as the previous case, the bombing case, or the serial bombing case, is easy to make the national news, and the nature of the death of one or two people in an ordinary homicide case is huge.

Eri Nakano is now the "strong general" of the Hirarano Police Station, and there are three groups of people under him, and they were also assigned tasks at the meeting of the search headquarters, so she immediately went to invite the "elite soldier" Nanahara Takeshi to help analyze the case and strive for additional insurance.

The safety of staying at the police station is still guaranteed, and the prisoner is not crazy enough to dare to bomb the police station, plus there is a consultant fee to take, and it was quite pleasant to cooperate with Eri Nakano before, and Nanahara Takeshi also brought Kiyomi Ruri over to play soy sauce, and rummaged through the case information at will to see if he could provide some advice for the arrest of the prisoner.

The first time the crime occurred was at 9:32 this morning, on a busy commercial street outside the city center, a man suddenly rushed out of a small alley, with an improvised bomb tied to his back, crying "help", "help me", "please, please help me cut the blue line" and so on, holding a pair of scissors to look for someone to help dismantle the bomb, but only scared the people around to flee in all directions, there was no bomb disposal expert at the scene, no one dared and no one was willing to help.

About five minutes later, there was a loud muffled sound, and in full view of everyone, the man was in a desperate howl, his back exploded, and the person flew out, the flesh and blood were blurred, and he died on the spot, and by the way, it affected several people around, causing three people to be slightly injured, many people suffered minor burns to their respiratory tracts, and caused a larger-scale panic escape, causing dozens of people to break their heads, abrasion their knees, and twist their ankles.

"The explosives turned out to be ammonium nitrate glycerin, I said why the sound was so weird." Nanahara Takeshi looked at the information, and his mind made up the scene at that time, but he solved a small doubt before.

The first case occurred earlier, and the forensic division had already completed the on-site investigation and search, and the victim's body was not discussed, which was really tragic, but the fragments of the improvised bomb were found, and the appearance of the bomb was probably restored, and the explosives were also tested, which was rare and efficient.

"What is ammonium nitrate glycerin?" Kiyomi Ruri was watching the criminal police officers in the big office come and go, with an elite demeanor, and her beautiful big eyes were full of envy, and she really wanted to join them to work together, and she came back to her senses when she heard Takeshi Nanahara's words, and by the way, she wrote down the main points of knowledge - when the ammonium nitrate glycerin agent exploded, it sounded like a super big fart from a distance.

Nanahara Takeshi was also interested in this matter, and went to look at the photos of the bomb fragments found by the forensic class from the first crime scene, and casually explained: "An explosive that is easy to synthesize and can release toxic gases. The disadvantage is probably that the power is relatively small, and it is also more dangerous when crafted by hand, so it is easy to collapse yourself first, and the advantage is that it is difficult to trace the source. ”

Kiyomi Ruri didn't understand, and he couldn't understand the string of chemical terms on the data, so he was curious: "Why is it difficult to trace the source?" ”

"Because all the materials can be obtained legally, the main material is fatty pork, you just buy 100 kilograms at a time, and no one will suspect that you are trying to blow up others, let alone record it."

"Can fatty pork still blow people up?" Kiyomi Ruri was stunned, and remembered the back pot meat, which was the fat pork she thought was the most delicious, but she never expected that such a delicious thing could become a murder weapon.

"Of course, everything in this world can be a murder weapon, as long as you refine the fat pork oil and add caustic soda, you can get soap and glycerin, and then combine nitric acid and sulfuric acid in a ratio of 3:3:4 and ......" Nanahara Wu stopped talking halfway through his casual words, "Forget it, I won't talk to you in detail, lest I turn around and blow myself up, but all the materials needed for this explosive can be separated or synthesized by themselves in household daily necessities, and it is easy to avoid control." ”

After a pause, he added, "If you really don't understand, you can understand this explosives formula as Nobel's 'Denamai formula', Nobel is said to have only studied in elementary school, and he has no sense of science, and he is not afraid of death, and dares to mix nitroglycerin with all kinds of things, and finally made a fortune." The same is true for today's prisoners, using an outdated, low-power explosive that can be hand-mixed by the indigenous method. ”

Kiyomi Ruri actually didn't understand too much, she didn't know what the Denamai formula was, but in order not to appear too ignorant, she suddenly realized: "So that's the case......"

The explosives are not easy to track, so it seems that she can only find clues from the victims, but she found that Nanahara Takeshi was still looking at the fragments of the bomb, and couldn't help but wonder again: "Can you find clues on these fragments?" ”

Nanahara Takeshi shook his head: "No, it's all rough handmade products, from the brace rod, fixing bolt to plug plug, medicine pool, and igniter, it looks like it's all homemade, with obvious traces of hand-polishing, but combined with explosives, it can already explain a problem." ”

"What's the problem?"

Nanahara Takeshi said with a smile: "It is very likely that the prisoner is self-taught, or the old-fashioned textbook used, and he is a little crazy, he is not afraid of death at all, and the production is so crude, it is very likely that he will blow himself up or blow himself up in the hospital before committing the crime." ”

Kiyomi Ruri looked at him speechlessly, this analysis for a long time came out of a fart, the prisoners are blowing up around the city center, you say he is mentally normal, is that possible?

She was speechless for a moment, then looked at the simple picture of the restored bomb, and asked a little strangely: "Okay, let's be a little crazy to be the prisoner first, but he also put a timer on the bomb and gave the victim a pair of scissors, so that he could run and ask someone to help cut the wires...... What is he trying to do? If someone really helps cut the wires, can the bomb really be defused? ”

Nanahara Takeya looked at the part of the restoration diagram about the bomb timer, nodded slightly, and said, "Theoretically, if you can cut it right, you can indeed disable the bomb." As for what he is trying to ......"

Kiyomi Ruri perked up, solved a puzzle that had puzzled her for a long time, and asked excitedly, "Can you really stop?" I thought it was made up in movies and TV series. ”

"Art comes from life, and that part has been adapted, but it's really not made up." "In the simplest terms, the timer is a parallel circuit with two branches, the initiator is placed on one of the branches, and the other branch is a simple wire.

There is an explanation in the science textbook that if in the parallel structure, one of the two branches has resistance, that is, the timing initiator, and the other branch has no resistance, the current will all go from the non-resistive branch, and the ignition cannot work without current, and the bomb cannot be detonated at this time, so that the mechanical or electronic structure of the initiator takes effect, so that the resistance disappears, and the current flows into this branch, so that the ignition can be excited, and the ignitor ignites the medicine pool, causing a series of explosive reactions.

So if you cut the right wire, you can theoretically really stop the bomb from detonating. ”

Kiyomi Ruri understood it, and felt that it was not difficult to defuse the bomb, so she immediately said excitedly: "It's that simple? Wouldn't I just cut all the wires? Or simply pull out the battery, so that the timer is out of power, and it won't detonate! ”

Nanahara Wu looked at her and couldn't help but smile: "You are really a genius, if the prisoner does not install a set of capacitive circuits to detect the voltage, it is indeed feasible, but it is more likely that the prisoner must have installed it, and the moment the voltage is unstable, you will be blown up to the sky immediately." ”

Oh, by the way, this kid is talking about the most simplified situation, the prisoner must not be so stupid, he will definitely mess around with some other things, and even design several sets of current circuits to prevent others from cutting wires, smashing the timer, taking the bomb away from the body, or simply picking out the battery.

But then again, it's no wonder that high school is beyond the scope of compulsory education, it can be regarded as higher education, it turns out that as long as you graduate from high school, it is enough to go out and commit crimes!

High school students are a bit good at learning things, and if they are not afraid of death, they can make their own time bombs if they learn well.

Kiyomi Ruri completely figured it out, gave up the idea of becoming a bomb disposal expert, and prepared to go back to continue to strengthen self-tuition, and the knowledge of high school must be learned well, otherwise let alone being a detective and a criminal policeman, even if you go to be a prisoner, you will be despised.

She quickly changed the subject, looked at the colorful photos of the wires and said: "If it is really possible for the bomb to stop working by cutting the wires, the prisoner gave the victim scissors and asked him to call for help, did he do it on purpose?" He also deliberately used different colors of wires for this purpose...... No, the time bomb in the movie seems to be a bunch of flowers, why is that? ”

"There is no problem in this regard, because everyone knows that bombs are super dangerous goods, and it is impossible to assemble them in their own homes or carry them with them every day, that is not preparing to commit a crime, that is to commit suicide, so they are temporarily assembled when they are used, and they do not divide the wires into lust, and when the prisoner connects the power supply, the ignition device, the spare ignition device, the powder magazine, the failed powder magazine, the trigger and the timer, he mixes and connects the wrong wire, and it is possible to blow himself up when assembling."

Nanahara Takeshi touched his chin and said, "But why did the prisoner allow the victim to call for help, and even gave the tools, it is indeed very strange, there should be some kind of purpose, but what this purpose is, it is difficult to judge for a while." ”

A black shadow immediately flashed in Kiyomi Ruri's mind, and he said vigilantly: "Could it be the mysterious person X?" He's out to sin again for fun? ”

"Who is Mystery X?" Nanahara Takeshi glanced at her in surprise, "Such a stupid code name, which character in the garbage?" ”

Kiyomi Ruri then remembered that this code name was given by herself, and she hadn't told Nanahara Takeshi yet, so she hurriedly said: "It's the accomplice of the last suicide fraud case, and he also sent you something, didn't you say that he was a perverted entertainment criminal?" Could it be that this time he tied a bomb to the victim and wanted to see the victim struggling for fun? ”

"Him?" Nanahara Takeshi was also very impressed by this person, but he touched his chin and thought about it, and muttered, "Probably not, he was induced to assist others in committing crimes last time, and personally went into battle to tie people up and tie bombs...... It doesn't match the characteristics shown last time, and the suspicion is not high. ”

Kiyomi Ruri also touched her little chin and thought about it, and felt that it made sense, and the mysterious person X gave her a feeling of manipulating the fate of others from above, and she went directly to commit the crime, and the style came down all of a sudden...... Thinking about it this way, it's really not very suspicious.

She hurriedly went to find the victim's information, and said: "Then let's take a look at the victim's situation, although it may be a randomly selected victim, but the prisoners have kidnapped the victims, at least they can leave some clues, and you can look for clues from here." ”

She was very enthusiastic, more enthusiastic than the criminal police, very active in solving the case, at least wanting to contribute, but before she finished speaking, the criminal police in the big office suddenly became in a commotion, and a person covered the phone and shouted excitedly: "There is news from the Xiaoli Police Department, and the prisoner called to make a request!" ”

(End of chapter)