After successfully thwarting the mysterious organization's evil plan, Conan and his friends' lives temporarily returned to normal. However, this peace did not last long.
One day, Conan received a mysterious invitation. This invitation was unlike any they had received in their previous adventures; its envelope was made of ancient parchment and bore a peculiar emblem, exuding a mysterious and solemn aura.
Conan opened the invitation, the contents of which were concise yet full of suspense: "Dear Mr. Conan and your friends, I sincerely invite you to a gathering held in an ancient castle. There, you will uncover a forgotten history and unravel a mystery concerning the fate of the world. I look forward to your arrival. —The Mysterious Inviter."
Conan shared the contents of the invitation with Ran Mouri, Ai Haibara, Yoru Kage, and Lin Yu, and everyone fell into deep thought.
"Could this be another trap?" Ran Mouri asked worriedly.
Nightshade shook his head: "It could also be an invitation from someone who genuinely needs our help."
Lin Yu seemed somewhat excited: "Who cares? We'll find out when we go!"
Ai Haibara calmly analyzed, "In any case, we must be fully prepared."
After some discussion, they decided to accept the invitation and go to the mysterious castle.
When they arrived at the castle, they were awestruck by its magnificent and ancient appearance. The castle walls were covered in moss, and the gates were tightly closed, as if telling stories of the past.
Conan stepped forward and knocked on the door. The door slowly opened, and an old man dressed as a butler appeared before them.
"Welcome, everyone. The master is waiting for you," the butler said, leading them into the castle.
The castle's interior was ornately decorated, filled with precious artworks and ancient books. They entered a spacious hall where a mysterious man stood by a window, his back to them.
"You've finally arrived." The man turned around, a mysterious smile on his face.
"Are you the one who invited us here?" Conan asked.
The man nodded: "That's right, my name is Victor, the owner of this castle."
Victor begins to recount the history of the castle, which was once the stronghold of a secret organization that possessed clues to a treasure that could change the world.
"What treasure?" Lin Yu asked curiously.
Victor's eyes were grave: "A mysterious treasure with immense power, but its power could also bring disaster."
Just then, an alarm suddenly sounded inside the castle.
"Oh no, someone has infiltrated!" Victor exclaimed.
Conan and the others immediately became alert and followed Victor to the location where the alarm had sounded.
They arrived at a basement and found a group of men in black trying to open a safe.
"Stop them!" Conan shouted.
Another fierce battle ensued. Ran Mouri's karate, Nightshade's agility, Lin Yu's high-tech equipment, and Ai Haibara's intelligence all played crucial roles in the fight.
After a fierce battle, they finally repelled the men in black.
"Who are they?" Ran Mouri asked.
Victor's face darkened: "They are another evil organization trying to obtain the treasure."
Conan frowned: "It seems things are more complicated than we thought."
Victor led them to a secret room containing some ancient documents and maps.
“These documents and maps might help us find the treasure and thwart the evil organization’s plot,” Victor said.
Conan and his friends began to study the materials carefully, and they discovered that clues to the treasure were hidden in a series of complex codes and puzzles.
“This won’t be easy to untangle,” Ai Haibara said.
But Conan was full of confidence: "As long as we work together, we will definitely find the answer."
In the days that followed, they worked tirelessly day and night to crack codes and puzzles, gradually getting closer to the truth about the treasure.
However, they constantly encounter various dangers and challenges along the way. Mysterious mechanisms and traps appear in the castle from time to time, and they are attacked multiple times by a mysterious organization.
On one occasion, they triggered a trap in a corridor, and a barrage of arrows rained down on them.
"Watch out!" Nightshade shouted.
Everyone scattered, while Conan quickly observed the pattern of the mechanism and found a way to close it.
On another occasion, they were surrounded by poison gas in a room.
"Quick, cover your mouth and nose with a wet cloth!" Haibara cried out.
Lin Yu used his equipment to create a small ventilation device, which helped everyone remove the poisonous gas.
Despite the numerous difficulties, Conan and his friends never gave up.
Finally, they solved all the codes and puzzles and found the location of the treasure.
But when they arrived there, they found that the evil organization had already gotten there first.
"Hand over the treasure!" the organization's leader shouted.
Conan and his friends, undeterred, engaged in a final battle against the evil organization...
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