While Gregory was concentrating on what happened to Franklin's expedition and Henry Ito, his men, the other forensics, were dealing with something else—something that was actually tricky, and that should have been the responsibility of Gregory himself. However, because the Franklin expedition was so important that Japan was able to acquire the power of identification through diplomatic means, the priority of this matter was forced to be postponed.

Osamu Shida, 36, violinist and first graduate of the Domoto Conservatory, died from a propane explosion at a bar he ran.

Hisashi Sone, 36, viola player and first graduate of the Domoto Conservatory, died in a collision with the water when he fell into the sea due to a sudden damage to his parachute during a wingsuit flight.

What's even more troubling is that the two of them are very close to Renjo Yuhiko and Yosuke Mizuguchi, who were killed in the bombing of the Domoto Conservatory on September 19: they have long performed together as a piano quartet.

Based on these current conditions, it can be concluded that the deaths of the four of them are most likely not a coincidence, but a deliberate murder by the same criminal force.

At the same time, the test results of the water bottle that Maolilan had previously sent to the Metropolitan Police Department have also been released - it is injected with strong irritating ingredients that can damage the mucous membranes it comes into contact with very quickly, causing serious throat damage. If Miss Reiko Akiwa did drink it, her throat would not recover for at least a week.

But even if this is not an ordinary prank incident (considering the aftermath and the fact that the poisoner must have been well aware of the fact that Reiko Akiwa was going to attend a concert on the weekend), even if someone drove a truck to hit her after the poisoning failed to hurt Reiko Akiwa, the Metropolitan Police Department still did not stitch together this incident with several murder cases in the end - if these events are stitched together and looked at them as events in the same sequence of consecutive crimes, then an unavoidable problem is, Why did the murderer hurt the five of them, and why did he just find a way to cause harm to Reiko Akiba while killing the other four? There is not enough intersection between Reiko Akiwa and these four people, and it is difficult to find anyone who will hate all five of them at the same time.

Of course, not everyone is clueless about this.

"If the killer has a high degree of control over Reiko Akiwa's information—so powerful that he can immediately know about the fact that he didn't drink the drink—then the murderer would be well aware that when the bomb that killed Renjo Yuhiko and Mizuguchi Yosuke detonated, Kawasbe Soko was in the room. In this case, we must include Miss Kawabe Soko, who seems to have only been affected, among the targets of the murder - and we need to homogenize her with Reiko Akiwa. Fei Yingli explained the inferences of the three detectives in their family of four in front of Officer Twilight and others.

In this case, we can define the murderer's goal for the four first graduates as "killing", and the goal of action for Kawabe Soko and Akiniwa Reiko as "expelling (concert)". In other words, the murderer has no hatred for Kawaibe Soko and Reiko Akiwa, but has a reason to kill the four first graduates. From the point of view of Kawai Sotako and Akiwa Reiko, the most likely scenario is that kicking Kawabe Kanako and Akiwa Reiko out of the concert will have a rich enough personal reward for the murderer. ”

With that, Fei Yingli pointed to the picture of Chikusa Lara and Yamane Shion, who were the replacements for Kamibe Soko and Akiniwa Reiko. "The two of them have the most direct interests, as long as the two are driven away, then they themselves can be honored in the world music industry. But the question is, why drive two out at once? If this inference is true, then there is only one explanation for driving away two people at once and not just from the obstacle in front of them, regardless of the risk of exposure: that it was an incident committed by the two of them in conspiracy, so it is necessary to drive away both Kawabe Soko and Akiwa Reiko at the same time in order to distribute the benefits that can satisfy both of them. ”

"But the problem with such a corollary is, why kill the four first graduating students at this point in time? These four graduates have nothing to do with this concert at all, and even if the four of them are still alive, they have nothing to do with this concert. ”

"If you were to explain that...... We can't think of many plausible explanations at the moment - but according to what you've done before, Miss Yamane has been offered the opportunity to study abroad, and Chikusa is dating an Austrian musician and preparing to get married, and both of them may not return to China. If they want to take revenge, they will definitely do it while they are still in the country. ”

"But that's a bit far-fetched, isn't it?" Officer Shiratori raised his own questions. "It makes logical sense to say that, but ...... This explanation still avoids what kind of hatred there is between the four of them and the two hypothetical murderers you put forward. ”

"This requires you to assist in the investigation, as we have limited access to information." Fei Yingli spread her hands. "As for the second possibility, it's more ...... It's a fantasy. Unlikely, but once it is true, the consequences can be very serious. ”

"If the murderer's purpose was to protect these two people from the concert by keeping them from appearing at the concert, do you think it's possible?" Speaking of this, Fei Yingli glanced at everyone.

"Protection?" Officer Twilight frowned. "Lawyer Fei, can you elaborate on it a little more?"

"Although it is far-fetched to say that Chikusa Lala and Yamane Ziyin want to kill those four people before leaving, this reason for killing them as soon as possible still has its value. If these four people provoked someone and caused them to be killed......"

"Then why did you drive Miss Qiu Ting and Miss Riverside away?" Officer Shiratori was puzzled.

"In addition to the possibility that there are two substitutes who took the opportunity to take the position, there is also a possibility......" Fei Yingli picked up the pen and drew a circle on the outside of the photo of Chigusa Lala and Yamane Ziyin.

"What if the purpose of expelling those two was to allow the two of them to perform on stage that day, so that they could attack them from the crowd?"

All in all, the situation summarized by Fei Yingli can basically be expressed in the following sentence.

The murderer has a grudge against the four first graduates, and he has a crush on the Kawabe Soko-Akiniwa Reiko group, or he also has a grudge against the Chigusa Lara-Yamane Shion group.