After receiving the mysterious letter, Conan's mood turned somber. He told Ran Mouri, Lin Yu, and Ai Haibara the letter's contents, and everyone's expressions became serious.
"What exactly is the origin of this dark force?" Ran Mouri asked疑惑地.
Lin Yu frowned in thought: "No matter what, we must be prepared to meet the new challenges."
Ai Haibara calmly analyzed, "Let's see if we can find more clues from this letter."
They examined the letter again closely, only to find that apart from those few warnings, there was no other useful information.
Just when everyone was at a loss, Conan received another mysterious invitation. The invitation was unsigned, only containing an address and a time, inviting him to a remote ancient castle.
"Could this be a trap?" Ran Mouri asked worriedly.
“It’s possible, but this may be our only chance to learn about this dark force,” Conan said.
After some discussion, they decided to go to the castle together to find out more.
By the time we arrived at the castle, it was already dark. The castle looked eerie and terrifying, shrouded in thick fog.
They cautiously entered the castle, where all was silent except for the sound of their footsteps echoing in the empty hall.
"Is anyone there?" Conan shouted.
No one responded.
They continued walking in, when suddenly they heard a sinister laugh.
"Hahaha, you've finally arrived."
A dark figure flashed past them.
Ran Mouri was startled, while Lin Yu quickly drew his weapon and looked around warily.
"Who are you? Show yourself!" Conan said.
A dark figure slowly appeared before them; it was a mysterious person wearing a mask.
“Welcome here, brave children,” the mysterious figure said.
"What exactly do you want?" Conan asked.
The mysterious man smiled and said, "I just want to give you a chance to join us and rule this world together."
"Don't even think about it! We will never collude with evil forces!" Ran Mouri said angrily.
The mysterious man sneered, "Then you only have one path: death."
As he spoke, the mysterious man clapped his hands, and a group of his men surged out from all directions, surrounding Conan and his friends.
A fierce battle broke out.
Conan and his friends engaged in a fierce battle with the enemy. Ran Mouri's karate skills remained formidable, and Lin Yu's high-tech weaponry also proved highly effective.
Ai Haibara, meanwhile, searches for the enemy's weaknesses, providing tactical support to everyone.
Using his intelligence, Conan found the enemy's weakness and led everyone to gradually gain the upper hand.
Seeing that things were not going well, the mysterious man turned and ran away.
"Don't let him get away!" Conan shouted.
They followed the mysterious man to the castle's basement.
The basement was filled with a pungent odor and strange experimental equipment was scattered everywhere.
"Where is this place?" Lin Yu asked.
Conan looked around and said, "It looks like this is their secret laboratory."
Just then, the mysterious man activated a mechanism, and the basement began to shake violently, with stones falling from the ceiling.
"Oh no, this place is going to collapse!" Haibara cried out.
They frantically searched for an exit and escaped the basement at the last minute.
However, the mysterious person has vanished without a trace.
"Damn it, he got away," Ran Mouri said.
“It’s alright, at least we know they have a secret laboratory here, which is an important clue,” Conan said.
After leaving the castle and returning to the city, they immediately informed the police of their discovery.
Police launched a full investigation into the castle and uncovered more secrets about this dark force.
It turns out that this dark force has been carrying out a terrible plan, attempting to use a new type of virus to control the world.
"We must stop them!" Conan said.
They embarked once again on a perilous journey, striving to save the world...
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