"It's peculiar indeed."

Gao Cheng fell into thought.

I don't know which case it is this time, but I took the initiative to send a letter and performed in the bathroom, plus that prompt-like message, "It's only my ** that disappears, not the text."

It doesn't look like the sender is a prisoner, and if it's a predetermined murder type of criminal, there's no need to send that kind of letter ten days after committing the crime, and there's no need to provoke a high school detective.

On the contrary, it is a bit like someone who knows the truth and sends a letter to lure Hattori over.

So, what exactly is the secret of tiles? The house renovation in Osaka must have something to do with this secret......

"Joto!" Hattori said in annoyance, "How are you thinking about it?!" ”

"What?"

"I just asked you, would you like to go to Mr. Wakamatsu's house in Tokyo to investigate!! I told them that there were 5 people to come, but the uncle didn't seem to be available......"

"If it's an investigation of the case," Gao Chengding said, "then I'll go to the scene of the Karuizawa crime, you shouldn't have been there, right?" ”

"I haven't been there," Hattori said stunned, "I can't see it even if I want to, it belongs to Nagano Prefecture, so it's impossible to let an unrelated person in, right?" Hey...... Wait, the Nagano Prefectural Police ...... who govern Karuizawa You're probably looking for the one-eyed officer's help, are you? ”

Gao Cheng smiled: "You don't have to worry about this." ”

Although it is troublesome, but the cross-district assistance in the investigation, with his relationship with Yamato Dasuke, there should be no problem.

Shiliang Zhenchun pointed at himself: "In this case, I will ...... with you"

"I'm sorry," Hattori interrupted apologetically, "this is Tokyo after all, so it's better to bring an uncle." ”

"Me?" Mori Kogoro took the newspaper and said, "It's not impossible to go, but I'll ...... at night."

"If the legendary detective Mori Kogoro came to the door, it might be easier to investigate, right?"

"That's right."

The uncle was interested, and he felt that he had spoken to his heart all of a sudden.

Compared to playing mahjong and drinking, maybe it's a good idea to investigate?

……

In Nagano Prefecture, Yamato Dasuke happened to plan to go to the villa where the crime occurred at night to investigate, and immediately agreed after receiving a call from Gao Cheng, and asked Yui Uehara to pick up Gao Cheng from Karuizawa.

"It turns out that the Castle Detective also has a villa in Karuizawa!" After seeing the lakeside villa where Gao Cheng stayed, Yui Uehara was quite surprised.

I didn't expect Gao Cheng to be a little rich man, and he couldn't see it at all.

I bought it when I came here to handle the case before, and I was going to open a branch, but it turned out to be idle, and I only came here on vacation occasionally.

Gao Cheng has always been very satisfied with this lakeside villa, although it is not big or spectacular, but it is very delicate and poetic, and it is rare in Karuizawa.

The original owner of the villa was the group family that had a black magic incident nearby, and now he is dead, and the rest are in prison, but Gao Cheng of that big villa is not interested.

"Miss Yui is also on the scene for the first time?" Gao Cheng asked as he got into Yui Uehara's police car.

"Yes," Yui Uehara said, "Although I have already read the report, Xiao Dang still wants to take a look at the scene and want to find out the murderer's methods." ”

"Tricks?"

Gao Cheng looked at the night outside.

"Investigators didn't do blood tests on all tiles, right?"

"Yes, yes, just checked around the body...... Any questions? ”

"What you see is not necessarily the truth, I don't know what methods the prisoner used, but I think that the tile that left the blood stain should not have been taken away by the prisoner." Gao Cheng must have speculated.

"Why?" Yui Uehara looked puzzled, "Haven't you ever been to the scene?" ”

"Actually, just today, I heard from Hattori in Osaka that a guy who was suspected of being a criminal sent him a letter and specially demonstrated the modus operandi of the crime, and the tiles with the same letters disappeared, and he also left a message saying that the text did not disappear," Gao Cheng explained quietly, "Although I didn't see the scene, I heard that there were many notched tiles in the corner......

Wakamatsu family villa.

Yamato Dasuke waited until the two of Gao Cheng were in the bathroom together, and when they saw the diamond-shaped tiles on the floor and the wall, their faces changed instantly.

"Hey, Uehara! I haven't heard of it! The tiles on the scene turned out to be like this! ”

"Any questions?" Yui Uehara was surprised, "It's the same as what is written in the report, and the color gradually fades from top to bottom......."

"No, the overall feeling is an illusion of the eyes!"

Yamato Dasuke touched the tiles and said in a deep voice: "This should be a diamond-shaped illusion with shadows, and it is a visual error created artificially......"

"That's right," said Zhu Fu Gaoming from the outside, "a strange oblique, the angle of the upper and lower two acute angles of each diamond is between 30 and 40 degrees, and it is a slight color change from top to bottom.

"When the human eye observes the color of the junction, it captures each point separately......"

Gao Cheng stood aside in a daze, he didn't know much about visual errors, brain loopholes, etc., but he could understand that visual deception was never uncommon.

In general, every tile here is actually the same color, because it was originally the same batch of tiles.

On the way here, he had a similar guess......

Because all the clues point to a visual error.

It is very likely that the combination of the wall corner notches seen by Ye is those English letters, but someone changed the position by taking advantage of the power outage, so it is said that the words have not disappeared, and the click response should be the sound of prying the tiles.

"Clever!" Yamato Dasuke scolded, "What are you doing here? Didn't the headquarters take over this incident?! ”

"Oh?" Zhu Fu Gao Ming said in surprise, "Haven't you heard? I'm starting to be transferred back to the prefectural police headquarters today, and thanks to the help of the detectives from the city last time, I have spent a lot of effort myself......"

"Dididi!"

Gao Cheng's mobile phone suddenly rang in the bathroom, and he didn't care about the two Nagano prefectural police officers who were competing against each other, so he hurriedly walked outside to connect it.

"Yes, I'm at Karuizawa...... What the? The president's son was killed?! Hey ......"

"We still don't know the situation yet," Hattori looked at the police officers investigating at the scene, with a heavy expression, "When everyone was eating the baumkuchen, that guy was poisoned right under our noses!" The strangest thing is that except for the one he eats, there doesn't seem to be poison on the other cakes......"

"Then how do you know that the cake was poisoned?"

"Because someone threw the capsule containing the poison into the black tea next to it to dissolve ......"

A sweat flowed from Hattori's swarthy face.

"Of the 8 equal portions of Baumkuchen, there were only two pieces left in the end, and the guy chose the poisonous one, and I don't know how the prisoner did it...... What's going on over there? ”

"I already know the method of disappearing words, and I have to wait for the forensic personnel to come and investigate, and now the problem is ......"

Gao Cheng raised his head, turned to look at the bathroom and asked, "Officer Yamato, who was the first person to find the body?" ”

"It's the maid of the Wakamatsu family," Yui Uehara said, "and it's the maid who said she saw the president leave blood on his finger." ”

"She's the only one?"

"It seems that there is still Mrs. Wakamatsu, and the maid called Mrs. Wakamatsu over, but Mrs. Wakamatsu didn't notice the bloody ......"

"Really?" Gao Cheng frowned, "In this case, I'm afraid the case is not over yet." ”

"Huh?"