Once Takato understood the method of the locked room, he knew that Suzuki Sonoko's disappearance this time was not a simple missing person case; it was more likely that she had been kidnapped! If it was just a disappearance, such a short time would probably not be taken seriously even if the Police were notified, but if it was a kidnapping, the nature of the case would be different.
Therefore, after Takato understood this, he immediately secretly sent a text message to Inspector Megure, asking him to quietly bring people over—from the current situation, the other party should not have enough time to take the person out of the school, but he still had no clue where the person was hidden.
However, looking at these two Female students from Teitan High School, Takato was a little curious. If this method was used, it could be implemented at any time, so why choose today? And today was a weekend, how did the other party know Sonoko would come to school today?
Suddenly, Takato thought of the situation when he met Sonoko at the school gate earlier—Sonoko heard that there would be handsome guys at the kendo competition, so she specifically came to school to watch! And it just so happened that after Sonoko arrived, Shinichi Kudo went back.
Huh? That's right! Shinichi Kudo went back!
The biggest difference today was that Shinichi Kudo went back first! As a premeditated kidnapping, and the target was a friend of a Famous Detective, then as the planner of the operation, they certainly would not want a Famous Detective present!
However, Suzuki Sonoko being kidnapped would inevitably be known by Shinichi Kudo in the end, so Shinichi Kudo's temporary absence could at most only help with the initial action—could this point be very important?
In other words, this plan dared not be implemented when Shinichi Kudo was present? Afraid of being seen through? If it was seen through, the plan would fail? If so, now that he understood the trick of the locked room, should he think of the whole thing more simply?
Previously, he considered that the whole thing might have accomplices helping to take Suzuki Sonoko out of the old school building, but there should not be enough time to send her out of the school. So he called the Police over, but dared not let the Police investigate openly, because he was worried that Suzuki Sonoko was still in their hands, and rash action might pose a threat to Suzuki Sonoko.
But if he thought about it more simply—could it be that the person had not been taken out of the old school building at all?
From the current observation, in this old school building where only the art club had activities today, one entrance and exit had obviously not been opened for a long time, and the other was directly facing the playground. Even with help, it would be difficult to take someone out, so it was possible that the person was actually still in this old school building! If so, would accomplices really be needed?
"Have you checked all of this old school building?"
Takato asked the two Female students.
"We've basically looked everywhere we could find, but we didn't find Sonoko."
Moemi Nakagawa said.
Hearing this, Takato pretended to ponder, then said, "Hmm… I see. For now, we cannot rule out the possibility that Suzuki went somewhere else. Nakagawa, why don't you go look elsewhere? Ayako, you take me to the old school building again."
"Okay."
Ninagawa Ayako responded.
"Why don't Ayako go look elsewhere? I'm more familiar with this old school building, so I'll look more carefully."
Moemi Nakagawa said.
"That works too."
After getting their answers, Takato immediately turned and walked into the old school building, his back to the two, a smile on his lips!
At this moment, at the Fujimaru family, Hattori Heiji and Shinichi Kudo had already set up the facilities in the house, preparing to start the re-enactment of the case.
"It's starting! Everyone watch carefully!"
Hattori Heiji said, turning his baseball cap, which was originally worn backward, to the front, then came to the mixing console and started playing music.
The large stereo in the living room played loud music, just as everyone outside had heard when the incident occurred.
But after a long while, nothing happened.
"What's going on, Heiji. We only heard music, no strange sounds at all, nothing happened!"
Toyama Kazuha came up and asked.
"What's going on! This should be the method!"
Seeing that the expected result did not appear, Hattori Heiji was also surprised, putting his hands on the mixing console, looking at the various buttons on the mixing console, and said in confusion.
And Shinichi Kudo, who was beside him, could not help but fall into thought about such a result, then, the two simultaneously thought of something, raised their heads, and looked at each other.
"So that's it!"
Hattori sighed with sudden realization.
Then Hattori and Kudo walked in different directions, Kudo came to the mixing console, while Hattori walked behind the wall with the art photos.
Behind the wall, on a shelf full of various audio equipment, Hattori found a speaker that was not connected to power, and said with great joy, "It really is like this!"
And Kudo, on the other side, turned off the music at the mixing console.
"Why turn down the music?"
Ran asked somewhat puzzled.
"Well, everyone, let me show you now!"
"The one and only truth!"
Hattori and Kudo said in unison, making the two smile at each other.
Kudo controlled the buttons on the mixing console, turning up the volume of a certain frequency band, but everyone heard nothing, but soon, something unexpected happened!
At the position of the originally broken art photo frame, a repaired art photo frame of the same size belonging to the hostess had been replaced, and at this moment, it suddenly began to vibrate.
"Oh! Superpower again!"
Seeing such a scene, Ran could not help but think of the live TV broadcast she attended not long ago.
"Fool! How could that be!"
Kudo said, "It's about to start!"
Then he turned the volume of that frequency band to the maximum, and immediately, the glass of the art photo frame actually shattered like that! All the glass fragments scattered onto the sofa. This scene startled both Ran and Kazuha!
"Why! We didn't do anything!"
Ran asked in confusion.
"Resonant frequency. This is the method used to break the glass!"
Kudo explained, but some of the people present obviously did not understand.
And Inspector Miwako Sato, who was nearby, understood the key after hearing this explanation.
"Resonant frequency? Is it resonance?!"
"That's right. All things have their own frequencies that are prone to vibration. The music played in this room has a frequency added that will only cause the photo frame to vibrate and peel off."
"In order to make it emit a specific frequency, the speaker behind the photo frame was tampered with."
Kudo and Hattori explained the principle of the incident one after another, but Kazuha still didn't quite understand: "But we didn't hear any sound!"
"Fool. Sounds over 20,000 hertz cannot be heard by ordinary people!"
Hattori explained.
"The glass on the photo frame is like a swing in the park; the harder you push, the more it swings."
"Similarly, with a specific frequency, the vibration of the glass will become more and more intense, and when it cannot bear it, the glass shatters! The culprit used this invisible weapon to kill Miss Hidetsuko."
"And this invisible weapon is resonance!"
Kudo and Hattori said one after another, and Fujimaru Kazuo quickly explained, "Wait! I never used this frequency! And so far, this song has never shattered glass!"
After hearing this, Hattori could not help but smile, "Of course! Someone who knew you would use this song to cover up an affair made a CD with a specific frequency added! Right, Toiru!"
"That's right! You are the culprit!"
Saying that, Kudo and Hattori simultaneously pointed to the culprit—Fujimaru Yoshino!