Ke Xue: Xiaolan delivers goods to your door at the beginning

"So, Ms. Saeki, you are so impressed by Mr. Fujimaru's talent." Inspector Megure once again showed an expression of emotion.

"It's just like the relationship between Chopin and George Sand."

"Indeed."

Heiji nodded at Lin Xiaofeng's words.

“I know Xiao Lingbang, but who is that George Sang?” He asked Heiji with a puzzled look on his face.

"Chopin's patron was a beautiful woman dressed as a man."

"A woman dressed as a man?"

"Chopin was forced to leave his homeland due to the revolution and fell into financial difficulties. At this time, he met a wealthy widow named Sand in Paris. Sand greatly admired Chopin's talent and provided him with financial assistance."

"Wow—" Heiji's words piqued Kazuha's interest.

“Sang was a rare sight among women at the time; she liked to wear men’s trousers and smoke.”

“Indeed, it’s exactly the same as the relationship between Mr. Fujimaru and Yoshino.” Kazuha blinked as she watched Yoshino, dressed in a smart women’s suit, flick the ash from her cigarette into the ashtray on the table.

"Chopin's first impression of Sand seemed to be that she was almost like a man, but Sand herself also had musical talent and refinement, and quickly recognized Chopin's talent."

Lin Xiaofeng continued speaking, picking up where Heiji left off.

"So, contrary to his first impression, Chopin was then unconsciously drawn to San, who fully understood his music."

"After getting to know Sand, Chopin discovered that she was completely different from her appearance; she was a woman full of maternal love. Moreover, Chopin was ill and could not survive without someone helping him often, so he needed Sand very much."

“He’s actually a very gentle person…” Hongzi thought with a smile about the relationship between Chopin and San.

"In Sang's house there was a sunny room where Chopin got his piano and nourishing food, which enabled him to write one masterpiece after another."

"It's truly a wonderful relationship."

Like Akako, Kazuha was lost in thought, imagining the two of them living a life filled with love.

“I see. Indeed, the relationship between Mr. Fujimaru and Ms. Yoshino is very similar to that between Chopin and George Sand. But who is this? He doesn’t look like the young Mr. Fujimaru.”

Next to the photos of Fujimaru and Yoshino was another photo of a handsome high school student in a neat school uniform. Inspector Megure was looking at this photo when he asked the question.

"Ah, I'm also quite interested in that photo." As he said this, Lin Xiaofeng also looked at the photo.

“Yes, that’s… my son. He passed away fifteen years ago…” Yoshino’s face suddenly darkened.

“Huh, it’s gone…” Heiji was surprised.

"He's been in poor health since he was a child..."

"I'm not feeling well..."

Indeed, as Yoshino said, the boy in the photo had a skin tone that was even whiter than the girl's, and there were slight shadows under his eyes, making it clear at a glance that he was not in good health.

"Oh, I'm so sorry..."

Seeing Yoshino's darkening expression, Inspector Megure bowed his head and apologized. Next, Heiji turned to Fujimaru and asked seriously, "Just as Chopin grew because of Yoshino, Mr. Fujimaru, you were able to showcase your talent and achieve great success because of Yoshino's vision. But recently you seem to have stopped writing any new compositions. Why is that?"

"Heiji, that's a really rude question." Kazuha glared at Heiji.

"No, it's okay. I've been feeling a bit down lately... and I've had a headache these past few days..." Fujimaru said, rubbing his temples with his fingers, looking uncomfortable.

"Headache...?" He Ye asked with concern.

"Hmm." Fujimaru nodded, rubbing his temples.

"But won't this cause a conflict with Ms. Nakajima from the record company? After all, the record company needs to release CDs to sell." Looking at the dead Hideko, Heiji asked again.

"So, Kazuo, when I left this morning, you and Ms. Nakajima were arguing quite a bit..." Yoshino blurted out, following Heiji's question.

"what?"

Yoshino's words immediately drew everyone's attention to Fujimaru.

"Th-that was just a discussion about the CD that's going to be released this time!" Fujimaru hurriedly denied Yoshino's words.

"Really?" Yoshino stared at him as if she could see right through Fujimaru and asked.

"Really, please believe me," Fujimaru pleaded desperately.

"Um, um, I believe you, but..." Yoshino said, glancing at Megure and the others, but they all looked at Fujimaru with suspicion.

“Mr. Fujimaru, there’s no use hiding it. You might as well just confess!” Takagi glared at Fujimaru, putting pressure on him.

"I...I already said I didn't kill him!" Fujimaru desperately denied it, but the suspicion in everyone's eyes did not disappear.

Lin Xiaofeng asked Fujimaru again, "Mr. Fujimaru, when did Ms. Hideko sit on that sofa?"

"This... she said that spot is the best place to listen to the piano... ah, that's where she started today."

Listen to my CDs...

"Listen to... a CD..." Heiji nodded, arms crossed.

Lin Xiaofeng asked Fujimaru V, "You just said you've had some headaches lately, what kind of symptoms are those?"

"It feels like only the air around me is subtly vibrating, it's really uncomfortable. This keeps happening lately, and I can't stand it anymore..." Fujimaru frowned deeply and rubbed his temples hard again.

"The air is subtly vibrating...?" This sentence caught Lin Xiaofeng's attention.

"CD... barking dog... shattered picture frame glass and a headache..." Lin Xiaofeng muttered to himself, as if talking to a Buddha, "Strangely, I can't find the weapon that broke the picture frame glass... Interesting..."

After saying that, Lin Xiaofeng turned his gaze to the CD player, tuner, and huge speakers placed in the living room.

"I see!" Lin Xiaofeng laughed and raised his voice.

"Ah, Brother Xiaofeng, you've already figured it out?" Heiji looked at Lin Xiaofeng with surprise and resentment.

Lin Xiaofeng shrugged and walked to the equipment to begin his investigation. "Just as I thought."

Watching Lin Xiaofeng examine the equipment, Heiji couldn't help but ask anxiously, "What exactly is going on?"

"I know what the trap for the cause of death is."

Everyone's attention turned to Lin Xiaofeng.

"You don't actually need something hard to break glass," Lin Xiaofeng smiled. "Inspector Megure, you've led us into a misconception..."

"Huh? Then why did the glass shatter and pierce Hideko's neck?" Officer Sato asked, puzzled.

"Yes, the forensic team has searched so thoroughly, but they still haven't found what broke the glass." Inspector Megure looked on with a doubtful expression as he watched the forensic team frantically searching the ground.

"Although the forensic team has tried their best, they just can't find it no matter how hard they search," Lin Xiaofeng said to the team. "Huh, what's going on?"

The forensic team looked at Inspector Megure, but Megure shook his head, looking puzzled.

· ······Requesting flowers· ····

"As I just said, you don't necessarily need something hard to break glass," Lin Xiaofeng laughed again.

"Brother Lin Xiaofeng, could you explain this to us?" Inspector Megure said.

"To put it simply, the perpetrator used something that only a dog could detect to kill someone."

"Huh? Something only a dog can detect?" Heiji asked in surprise, then suddenly realized, "Ah! I see!"

Lin Xiaofeng smiled and said, "That's right. It started when the children, dressed up, walked into the yard on Halloween night, and then the neighbor's dog started barking wildly."

"Yes, you mentioned that earlier too. Dogs have a sense of territory, but it's strange that when someone leaves this house outside their territory, the neighbor's dog barks fiercely."

Inspector Megure recalled what Lin Xiaofeng had said.

"Yes, the neighbor's dog is barking because it heard a loud noise."

"A very loud sound?" Lin Xiaofeng's words surprised Megure, who asked in return.

"Yes, because dogs can hear sounds that humans cannot."

"Sounds that the human ear cannot hear... The human ear can hear sounds from 20 Hz to 2 Hz, right?"

"Yes, but there are sounds with even higher frequencies."

"A high-frequency sound, a dog whistle? A dog whistle seems to emit a high-frequency sound that only dogs can hear..."

.... ...... ....

"No, it should be a sound-producing object that is larger than a dog whistle."

"A sound source larger than a dog whistle... Hmm, but why did the glass frame of the Chopin portrait shatter?"

Inspector Megure asked Lin Xiaofeng a question, looking completely bewildered.

"Because of resonance. The prisoner used ultrasound, which is inaudible to the human ear, to cause the glass to resonate." Lin Xiaofeng said, taking a fine glass from the shelf of the indoor bar in the living room and flicking it with his finger. A crisp "ding" immediately echoed in the room.

"Shared, resonant?" Everyone, led by Inspector Megure, pressed for an answer.

“Yes, that’s right.” This time, Heiji nodded vigorously and continued, picking up where Lin Xiaofeng left off: “Every object has a natural frequency that can be easily triggered to vibrate.”

"Natural frequency?" Kazuha repeated Heiji's words, not understanding.

"Hmm. Just think about the autumn leaves in the park, and it will be easy to understand. A swing with a long chain swings at different amplitudes than a swing with a short chain, right? You can think of this as the natural frequency of an object."

As Lin Xiaofeng spoke, everyone began to imagine the scene of the swing.

"Hmm, and then?"

"If you want a swing to swing higher, you have to push it from behind, right?"

"Yeah, and then what?"

"The glass in a picture frame also has its own frequency. If vibrations of the same frequency push the glass, the glass will vibrate more and more. As long as this vibration continues, the glass will eventually shatter due to its own vibration."

"Huh?!" Led by Kazuha, everyone blinked at Heiji's explanation.

"But where did that synchronous vibration come from?" Inspector Megure asked again.

At this moment, Lin Xiaofeng, who was standing next to the CD player, spoke up: "It's probably coming from the CD that's playing in the player right now. The piano music we heard when we walked into the living room should have been from the CD, but for some reason, it stopped after we came in."

As he said this, Lin Xiaofeng slowly pressed the play button on the CD player, and a loud, passionate piano melody immediately poured out from the huge speakers placed on either side of the living room.

"Sure enough, this is the same song we heard outside." Lin Xiaofeng nodded in confirmation.

"Mr. Fujimaru, what is this piece of music...?"

Amidst the loud music on the CD, Lin Xiaofeng asked Fujimaru a question.

“It’s a piece I composed. Miss Hideko loved it. Because I wasn’t feeling well, she told me to listen to it and reflect on how I felt at the time, so I could work harder. Today, until she died, she was sitting in that same spot listening to this piece.”

"Just as I expected," Lin Xiaofeng said, walking towards the tuner. "As I predicted, the tuning keys for emphasizing the high frequencies are all set to the highest position."

Indeed, as Lin Xiaofeng said, the tuning keys for the high frequencies on the equipment are all set to the highest position.

581. Koizumi Akako: Hattori Heiji, do you have a cuckold fetish?

Indeed, as Lin Xiaofeng said, the tuning keys for the high frequencies on the equipment are set to the highest position.

"Furthermore, the speaker shows signs of having been recently moved to face the painting." The huge speaker left a clear mark on the carpet because it had been moved to face the picture frame.

"So, let's see if it can actually emit ultrasound." Lin Xiaofeng slowly moved the glass on the table to the thick sheet music placed to the side, held it up high beneath the broken glass of the painting, and held it up. The glass on the sheet music immediately began to vibrate slightly with a clicking sound.

"Wow, it's really vibrating!" Kazuha exclaimed, her eyes wide as she looked at the vibrating glass.

"Really?" Hongzi was also taken aback.

"Heiji, adjust the frequency of the tuner slightly." After Lin Xiaofeng said this, Heiji, disguised as a wolf-sheep, approached the tuner and subtly changed the frequency. The next instant, the glass vibrated even more violently, and soon shattered with a bang.

"Whoa!" Inspector Megure and the others exclaimed in surprise upon seeing this scene.

“Although we can’t hear it, this is evidence that strong ultrasound waves are coming from the speaker,” said Number Four, pointing to the huge speaker.

"Then, so, it was this sound that caused the glass in the picture frame to shatter?" Inspector Megure asked Lin Xiaofeng again.

"Yes, that's right. The culprit probably knew that Ms. Nakajima always sat in that spot when she listened to this piece, so they investigated the inherent frequency of the picture frame glass and added ultrasonic waves of the same frequency to the CD to create resonance. '497'"

"I-I see." Inspector Megure couldn't help but slap his knee.

"Mr. Fujimaru mentioned that he's been having headaches lately, probably because he feels a subtle sense of air around him, right?"

"Yeah, it keeps happening lately, I can't take it anymore..." Fujimaru nodded in response to Lin Xiaofeng.

"Is this also because of the ultrasound being broadcast right now?"

"Huh?!" Inspector Megure's words startled Fujimaru.

"Yes. The prisoner must have experimented many times with a specially made CD in order to find the inherent frequency of the picture frame glass."

"I see, that's why..." Takagi suddenly realized.

"After confirming that the perpetrator could shatter the glass, he meticulously crafted a CD to replace the one Ms. Nakajima usually listened to. Anyone can create something identical from the CD case to the CD itself, as long as they know some editing techniques. Some illegal companies are also very good at this; if you commission them, making such a CD is not difficult."