Ke Xue: Shinichi and I are childhood friends

The two searched along the shore and found a small boat far away near the woods.

"Is this the boat?" asked Shiratori Renzaburo.

Yuya said, "I don't know, let's go over and take a look."

The two walked quickly to the boat and observed it carefully.

"Brother Kamiya, there seems to be something tied to it?" Shiratori Renzaburo pointed to a wooden pole on the boat and asked.

The wooden pole was placed horizontally in the middle of the boat to support the boat and prevent it from deforming.

Yuya walked closer and saw a ball of transparent fishing line wrapped around the wooden pole, and his eyes narrowed.

"So that's it, I know the murderer's method." Yuya touched his chin and said.

"You know? How did you do it?" Shiratori Renzaburo widened his eyes.

Yuya said, "This is how it is, this is how it is... This is how the murderer killed Miss Hanye."

"I see." Shiratori Renzaburo touched his chin and made the same pose as Yuya, "Then who is the murderer?"

Yuya sighed, "We have only solved the murderer's method of killing Miss Hanye, but we cannot confirm who the murderer is. It is better to say that the problem has become more complicated."

Shiratori Renzaburo was stunned, "What do you mean?"

Yuya said faintly, "Since we have confirmed that the murderer used a timer to kill, then the alibis of everyone at the time are no longer valid."

"And except for the three of us, everyone else can use this method..."

"Everyone is a suspect!"

Shiratori Renzaburo's face suddenly became solemn.

"Inspector Shiratori, don't tell anyone else about this for now. We still need to find further clues and evidence to confirm the murderer, so as not to alert the enemy."

Shiratori Renzaburo nodded seriously.

···

"Woo~~~"

The cry of the sirens sounded again, and this time, it sounded very close.

Yuya and Shiratori Renzaburo looked at each other.

Shiratori Renzaburo said: "Brother Kamiya, I remember you said that the cry of the sirens was caused by the tide?"

Yuya nodded and asked with a smile: "Why, is Inspector Shiratori scared?"

Shiratori Renzaburo smiled: "How is it possible? I'm just a little curious."

Yuya pointed to the direction where the sound came from: "Why don't we go and see? Maybe we can solve the secret of the sirens' cry."

Shiratori Renzaburo thought for a while and nodded.

The two of them distinguished the direction of the cry and walked towards the woods.

After walking a distance, they could no longer see the scene outside, only trees one after another.

Yuya looked at the road under his feet and said: "It seems that no one has walked this road for a long time." The ground was full of scattered dead leaves, and there were no signs of being trampled.

Shiratori Renzaburo suddenly shouted, "Brother Kamiya, look over there!"

Yuuya looked in the direction he pointed and found a man-made stone doorway.

"Is this... the entrance to the naval base?" The two looked at each other.

"If there are other people on the island, they are likely hiding here." Shiratori Renzaburo said.

Yuuya nodded.

Shiratori Renzaburo had just checked a part of the area and had not been here before, so he could not be sure whether there were really no other people on the island.

The two of them each found a sturdy branch as a temporary weapon and carefully entered the entrance.

This base had long been abandoned, and nothing was left inside. It could only be inferred from the form of the building that this was indeed a base.

The two walked around inside and did not find any signs of human life.

"It seems that there should be no one else on this island except us." Yuuya said.

Shiratori Renzaburo nodded in agreement.

The island is not big. If there are people living there, there will be some traces left. However, neither Shiratori Renzaburo's previous search nor this abandoned base found any traces.

At this time, the cry of the siren sounded again.

The two followed the sound and continued to search for a distance. They found a huge cave under a pile of rocks.

At this point, the cry of the siren was very clear. Unlike what they heard at the hotel, they couldn't tell which direction it came from.

"The sound came from below." Shiratori Renzaburo frowned slightly.

"Go down and take a look. Be careful." Yuya said.

The two followed the rocks down to the cave and found a passage that was obviously dug by humans.

Following the dim passage forward, they soon reached the end.

At the end of the road was a small cave with an empty puddle filled with sea water, and at the other end there was a passage leading to the outside.The hole on the surface.

There is a torpedo stuck in the puddle, which has been partially submerged by the sea water. The surface of the torpedo is covered with traces of rust, and it looks like it has been here for some years.

"This is..." Looking at the scene in front of him, Shiratori Renzaburo widened his eyes.

"Torpedo... the wreckage of the Kaiten, right?" Youya said in a deep voice.

At this time, the torpedo suddenly made a hissing sound, and at the same time, the cry of the Siren also sounded.

"So that's it," Youya suddenly realized, "the sea water flows into the torpedo and squeezes the air to make a whistle-like sound. The different directions of the sea water flow cause different sounds. And this sound echoes and amplifies in the cave, and after it is transmitted through that hole, it forms the cry of the Siren."

"This is the truth of the Siren's cry."

Shiratori Renzaburo sighed: "I didn't expect the Siren's cry to come like this..."

"... Go back." Youya said, his face a little ugly.

"Are you okay?" Shiratori Renzaburo asked with concern.

"It's okay, I just remembered some bad memories." Yuya shook his head.

···

The two returned to the hotel and had dinner.

Yuya took advantage of Shiho Miyano's inattention and slipped into her room when she closed the door.

Shiho Miyano turned around, crossed her arms, and squinted her eyes at Yuya who was lying in the chair and refused to leave.

This person can't be allowed to stay in the room, otherwise, with his shameless level, he will stay in the room now, and he might even climb into the bed later.

"Get out, I want to sleep." Shiho Miyano started to drive him away.

Yuya wailed: "It's still early, let's chat for a while, I've been investigating all day today and my legs are almost broken."

Shiho Miyano pursed her lips. She also knew that Yuya had been running outside all day today, so she had to say: "Then sit for a while."

Yuya nodded repeatedly, and then patted his legs.

Miyano Shiho took a small step back: "What?"

Yuya blinked and opened his arms towards her: "I need to replenish some girlfriend energy."

"What girlfriend energy... just want to take advantage of me." Miyano Shiho muttered a few words, hesitated for a while and finally walked over obediently.

Yuya smiled and pulled Miyano Shiho's hand to hug her.

"Ah!!!!"

Suddenly, a scream came from the next room.