While the adults were discussing the case, the children were flipping through the papers.

"There doesn't seem to be anything strange about their results," Qian Yu frowned. "It seems that none of the old teachers have a unified negative opinion of these four people, and even the new teachers rarely have a consistent negative opinion of them."

"Hikaru Soma's grades are also very stable, and they are all at the top of the class." Conan saw this and sighed. "Maybe we won't be able to find any valuable information at all."

"There are too many old men over the age of 49 in the academy," Gray Yuan Ai took a document bag and handed it to Qianyu. "If you just turn the relationship like this, I'm afraid you can only make a lot of incomplete and ambiguous relationships in the end."

"Don't worry, I think I might find it." Qian Yu took the document bag, but he was not in a hurry at this time. "Hmm...... Is this information? ”

"Yes, they sent us all the information very obediently." Gray Plains nodded. "What are you going to do with it?"

"Something fun," said Chiha, tossing two pieces of Swiss candy into his mouth - since he started using auxiliary units to manipulate large units or perform high-load calculations, candy that was originally just a snack has become a necessary tonic. "Hmm...... Give me some time. ”

With that, he picked up another stack of photographs—some male, some female, but in fact there were only two people, a man and a woman.

The male is Hikaru Soma, and the female is Hikaru Soma's mother.

The face recognition module equipped with the auxiliary unit can not only check whether the two pictures are the same person, but more importantly, it is also equipped with a basic kinship algorithm, which can quantify and analyze the two-dimensional and three-dimensional images by using the program trained by the descriptor-based EigenFace3S algorithm pre-installed in advance into the auxiliary unit, and finally give the calculation results.

What he has to do now is to combine the faces of all the male teachers over the age of 49 in the academy with Hikaru Soma's mother, and then compare them with Hikaru Soma.

However, there were no matching results...... Of all the teachers and ordinary staff under the name of Domoto Conservatory, none of them matched Hikaru Soma. It's even quite ironic that among all the candidates, the most suitable for Soma Hikaru is actually a young teacher - Kasakazu Kiyomasa, born in 1963, and 31 years old this year.

He's even a month younger than Hikaru Soma, which has been ruled out in every sense of the word......

Confused, as if blindfolded in the night, unable to find the direction of hope.

……

That night, at the entrance to the concert hall, next to the entrance to the concert hall, a three-row sedan was parked there. There were five people in the car: Officer Twilight, Mr. and Mrs. Kogoro Mori, Mr. and Mrs. Mori Lan, and Conan.

"That's the only way to do it now," Officer Twilight nodded. "Brother Maori, there will be someone sitting with you in the VIP area provided by Miss Suzuki, and we are lurking on both sides of the stage - according to Lawyer Fei, if the murderer's purpose is to attack Yamane and Chigusa at the concert, then the murderer will definitely pay close attention to Yamane and Chikusa at any time. In such cases, we strive to identify potential killers as early as possible and try to stop them before they happen. If the other party has already started in advance......"

At this point, Officer Twilight glanced nervously in the direction out of the car window before whispering again to Kogoro Mori's family.

"If that happens, I've already told them, one of the pistols will be temporarily armed by you, and if necessary, you will be the main attacker."

"Me?" Mori Kogoro was taken aback. "Twilight ......"

"That's it - rest assured, you're a supporting character for the most part, and you're only here to support just in case." Officer Twilight signals Kogoro Mori not to react so much. "And didn't you try it at the shooting range before, your marksmanship is still so terrifyingly accurate."

"Hmm......" Kogoro Maori's face was a little delicate. But...... It's still a little weird, after all, I'm just a detective now. ”

While they had even imagined the possibility of a heinous public killing in a shootout, they soon realized that they were still underestimating their opponent – not so much in terms of madness, but in terms of how quickly they attacked.

……

"What?" Officer Twilight was taken aback.

"Yes," Domoto waved his expression rather solemnly. "We had received two hours ago that Rei would be escorted to this side, but we haven't seen her until now."

"......" Officer Twilight frowned, and immediately turned his head to look at Fei Yingli.

"Calm down," Fei Yingli's face was also not good-looking. "Reiko Akiwa...... If she is the target of the other party's murder, then the other party can do it before, so this attack should be the same as the previous one, hoping that Miss Reiko will be incapacitated and will not be able to attend the concert in the end. ”

"But, why is the other party so persistent?" Mori Kogoro pondered. "Obviously, Miss Reiko can only sing that song when she is strange and graceful, and she can't shake Chikusa Lala's position as the lead singer no matter what."

"Maybe this song is the deadliest," Conan said suddenly. "Maybe that's the problem!"

"You mean, the killer planned to attack Chigusa Lala and Yamane Shion during the course of Strange Grace, so the fact that Miss Reiko sang this song made it impossible for him to continue with his previous plan?" Kogoro Maori immediately understood what Conan meant. But why is it Amazing Grace, and is there anything different about this song? What are the conditions under which you can borrow in a time of amazing grace and not at other times? ”

"Just in case, let's check this as a possible direction of investigation," Fei Yingli's thinking is very quick. "Amazing Grace, and the two pieces before and after this song, all three of which match the four people who died - if I remember correctly, they formed a piano quartet, right, let's see if they have performed these three pieces, or plan to perform them, especially during the training camp that Hikaru Soma participated in during his lifetime. If they have an intersection, it can be determined that the murderer chose to attack "Strange Grace" for his unique considerations, and "Strange Grace" will indeed be the time when the murderer will do it. ”