and room.

"What are you here for?" Gray Plains asked.

"Look at things," Qian Yu said lightly, looking at the wall clock in the room. "Looks like I've seen something interesting."

After just 40 minutes of calibrating the clock once, the watch deviated by as much as 40 seconds – a chronograph with an error rate of one in sixtieth of the hour, which is outrageous for a utility.

So, what's going on here?

As common sense, the rotational rhythm of this pendulum is controlled by the pendulum, and the faster the pendulum turns, the faster the pendulum will be, and vice versa.

Well, this pendulum is slower by one-sixtieth because ......

The force on the pendulum is m*g*sinA (A is the angle of swing), and the distance used to calculate the swing of the period depends on the swing distance at the position of the center of gravity of the pendulum. In other words, the lower the center of gravity of the pendulum, the lower the point used to calculate the swing distance of the swing period, the longer the swing distance, and the longer the swing period. If the pendulum slows down, then it means that the center of gravity of the pendulum has shifted downward for some reason.

After using the pendulum period formula to do some mental calculations, Qian Yu opened the door of the pendulum box, and then reached behind the pendulum. Without two fumbles, Qianyu's expression changed.

"Found something good." The corners of his mouth were slightly hooked, and Qian Yu said to the gray plain behind him. At the same time, when his hand was withdrawn from behind the pendulum, there was already an extra gem in his hand.

"So, is this the real murderer?" Gray Plains asked.

"Looks like - I guess it should be, right?" Qian Yu wanted to nod, but after thinking about it, he stopped and replaced it with a more euphemistic statement. "If it's finally discovered, then Mr. Tsunashima will be finished, and maybe Miss Tosabin will benefit from that?"

"So what?" Gray Plains asked.

"Otherwise," Qian Yu pouted, then took out the armband of the Junior Detective Corps from his backpack, and after poking behind the pendulum a little more, the bill disappeared as well.

"Is there a mechanism in the back?" Gray Yuan said curiously.

"A containment box," Thousand Feathers shrugged. "I think it's been an agency for a long time, but it's not clear whether Mr. Teruya Gana himself knows about it."

"So you're going to test their reaction?" Gray Yuan Ai probably guessed Chiha's thoughts, and tentatively confirmed.

"yes," Thousand Feathers tilted her head. "If someone of them had found it by then, there was a good chance that that person would be the culprit - especially after he was surprised that it was a strange armband instead of the gem he wanted."

"By the way, you're not going to take this home, are you?" Gray Yuan Ai suddenly looked at the gem and asked.

"Someone's heirloom," Qian Yu smiled wryly. "If it was something else, it could have been bought for you is true, but this ...... Wouldn't it be nice to take it secretly? ”

"Huh?" Gray Plains squinted. "What bad things are you thinking?"

"When I didn't say it," Chiba shrugged. "But—"

At this moment, Qian Yu heard unusually hurried footsteps coming from the direction of the living room.

Although the pace was always fast, Chiba's auxiliary unit told him that the sound was getting quieter, which meant that the person walking was constantly moving away from him - in other words, if the person was indeed in the living room, then he was walking briskly away from the living room door.

"......" Qian Yu frowned, and exchanged a confused look with Gray Yuan Ai, who also reacted.

Brisk walking is obviously a very unusual behavior, so who is this brisk walking person, and what is he walking brisk for?

Thinking like this, Qian Yu put away the gem and walked to the living room with Gray Yuan Ai.

Before they could reach the living room, they heard a sound of surprise coming from the living room. "Doyle is here!"

This voice belongs to Mr. Tsunashima.

About five minutes later, Dr. Asasa, Conan, Ai Ashbara, Motota, Mitsuhiko, Ayumi, Teruya Kana, Miss Renko, Mr. Tsunashima, and Miss Tosabin were already gathered in the living room.

"Doyle," Kneeling next to a glass of water and an ice pack, Garner Teru happily hugged Doyle, who still looked lazy but had come back to life, his face full of lost joy. "Mr. Tsunashima, how did you find Doyle?"

"I was going to the living room to look for any clues that I had missed, but as soon as I got behind the speakers, I found Doyle lying there," Mr. Doyle replied. "Maybe it's tired of playing and running out on its own?"

"Behind the speakers?" Miss Tosabin suddenly thought of something, and walked behind the speakers. "Hey, old man, don't you see a problem with the speaker here?"

"What's the problem?" Mr. Tsunashima said as he walked over with a surprised expression. "What's wrong?"

"I see!" Miss Tosabin already looked equally surprised at this time. "All of this is a good thing you did, Miss Renzi, right?"

"Huh?" Miss Renko was stunned. "For ...... Why? ”

"You must be planning to hide Doyle in the speakers, to sneak it away and take it for yourself, right?" Miss Tosabin asked. "You don't even need to wait until the speakers are sent to your house in a few days before you take Doyle out, just find an excuse to come again tomorrow with a big bag, and then take the opportunity to put the already hungry Doyle in the bag and take it away!"

"No kidding...... Miss Renko was shocked. I...... Why should I do this? ”

"I don't think that's possible," Mr. Tsunashima stopped. "Mr. Garner just woke Doyle up with ice packs and water, which means that it should just be asleep - maybe it was playful and secretly hid in the speaker, evaded my not very careful inspection before getting out, and then fell asleep on the ground directly after it came out because it was too sleepy, right?"

At this moment, the vibration of the mobile phone rang - Gray Yuan Ai took out the phone and looked at the screen.

After a few moments, she spoke.

"Don't talk about that yet, I have a question." Facing everyone's eyes, Ashbara just looked at Mr. Tsunashima calmly.

"Little girl......" asked Mr. Tsunashima as she was stared at by Ashbara. What's the matter? ”

"Of course," Gray Plains nodded. "May I ask why you brought a piece of cake from a convenience store a few hundred meters away and fed it to Doyle?"