Ke Xuezhen, starting with hypnotizing Vermouth.

"You few members of the Mamiya family are nothing but a bunch of pathetic worms!"

"I've enjoyed these years, and even if I fail, I'll leave with the ideal of having pursued the treasure."

And you?

"A life lived in a daze."

Mutsumi Nishikawa became more and more excited as she spoke, and even slowly stood up.

Everyone instinctively took a half step back, except for Gu De, who stared at him with a half-smile.

Conan looked at Gu De and sighed inexplicably.

Gu De is really amazing!

No wonder Xiaolan and the others like him so much...

but.

Mutsumi Nishikawa is truly terrifying.

To describe something so evil as something so noble.

Even if such a person is sentenced to death, he probably won't be defeated!

They can even mock others.

It's a pity that those treasures haven't been found all these years.

While Conan was still lamenting, Gu De merely gave Nishikawa Mutsumi a cold smile:

"You're the only pathetic one here!"

"Actually, those treasures have always been right in front of you!"

"But you pathetic wretch, you never noticed, and even spent so many years searching for this and killing so many people."

"He even had plastic surgery done so that he looks neither human nor ghost."

"Tell me, who is the real victim here?"

Gu De's words drew the attention of both Mamiya Mitsuru and Mamiya Takato to himself.

The treasure left behind by the patriarch!

Gu De actually deciphered the code!

Nishikawa Mutsumi's earlier madness and hatred vanished for a moment; she simply stared intently at Gu De.

"You...you tell me, where is the treasure?!"

Mutsumi Nishikawa roared.

Conan also clenched his fist and looked at Gu De.

How long have you been here?

How can I resolve everything?

Not only did they expose Mutsumi Nishikawa, but they also solved the arson case from four years ago and the case of the servant's death in the forest two years ago.

Now, even the biggest mystery of the Blue Castle has been solved?

When did you do it?

How can it be!

Conan tends to believe that Gu De said these words only to put down the arrogance of Nishikawa Mutsumi, the murderer.

But then...

Gu De looked at Nishikawa Mutsumi and sneered, "It's about time, let's go!"

"Now it's time to put an end to this mystery!"

Mamiya Mitsuru and Mamiya Norito instinctively asked their servants to follow, leaving only the gardener and another male servant dragging Nishikawa Mutsumi behind.

"Actually, this mystery is quite simple."

"What you're saying about the master leaving that chessboard in the courtyard already makes things quite clear."

Gu De explained as he walked.

checkerboard?

Mutsumi Nishikawa, Mitsuru Mamiya, and Norito Mamiya all wore expressions of disbelief.

That chessboard has been studied by the three of them for far too long!

How could there possibly still be clues?

Even the black and white chess pieces have been studied!

The three little ones and Yukiko Kudo excitedly followed behind.

Only Conan, rubbing his chin, looked completely bewildered.

"Strange, why didn't Gu De mention the strange phenomenon in the tunnel just now?"

"There were clearly other people in the tunnel!"

"But when I came out, no one mentioned that anyone else was missing!"

"No, could it be that Gu De already knew all this, or that there's some other inside story?"

"So Gu Decai didn't mention it?"

"This guy..."

Conan watched Gu De's retreating figure, feeling utterly displeased.

Why don't you mention it anymore!

Could there be other secrets hidden in that tunnel?

"Click~"

Pushing open the gate and stepping into the courtyard, a chessboard suddenly appeared.

Gu De walked up to the white knight at the edge and patted him on the shoulder. "Actually, this code is very simple."

"The old master's will required you to keep the lawn, which was a reminder that the tool for deciphering the secret is this chessboard."

“You can see that the white knight and the other two black knights are facing the same direction.”

"This means that the direction of the chessboard is clear, that is, the direction of the white pieces is the positive direction, so we continue to check all the squares where the white pieces are located."

"The white knight's square is the first one, at position E1, followed by G4, G5, H5..."

Finally, by taking these letter parts, we can form an egghead.

Gu De explained the chessboard.

The three little ones could only scratch their heads, completely oblivious to what was being said.

Conan, who was standing to the side, pondered for a while while rubbing his chin, and then he understood.

"Shin-chan, explain this to your mother!"

Yukiko Kudo and Shin-chan are squatting next to Conan.

Conan was somewhat helpless, so he pretended to explain to the three little ones, so that Yukiko Kudo could also understand.

Wow! Brother Gu De is so amazing!

"Yes, Brother Gu De is awesome!"

"What? Mitsuhiko, what is Conan talking about?"

After a while of trying to understand, the three little ones gradually began to react.

"egghead"

Mutsumi Nishikawa was somewhat puzzled.

Noble Lady Mamiya suddenly realized what was happening.

"Wait, egghead."

"I feel like I've heard this word somewhere before!"

Mitsuru Mamiya nodded: "Yes, I used to call the Master an intellectual who only spouts fallacies."

"But, this is different from the master's..."

"and many more!"

"Could it be... the portrait of the master?" "But is there something wrong with that portrait?"

"We've...studied it many times..."

Gu De smiled and pointed to the black chess piece not far away.

"We just used only the white pieces to confirm the portrait of the lord."

"Based on this pattern, we can determine that the black pieces are also part of the key."

"Why don't you draw a two-dimensional diagram of this chessboard and the pieces on it?"

After Gu De finished speaking, Mamiya Mitsuru and Mamiya Noble immediately brought out a pen and paper.

Since Conan had nothing, he could only hop on his short legs to watch the two's movements.

"This is......"

This time, Mamiya Nobleman acted extremely quickly, and after drawing the chessboard and the distribution of the pieces, he immediately understood the meaning.

"Yes, what you need to do is rotate the portrait of the lord counterclockwise!"

Gu De maintained a calm demeanor.

However, those around them were far from calm!

Thank you all for your support, and I wish you a Happy Chinese New Year.

Chapter 218 The Metropolitan Police Department's Invitation to Lecture

The mystery that had remained unsolved for so many years was solved by Goo De in just a few hours!