Back in the country, Conan and his friends returned to their peaceful lives. However, this peace did not last long.
One day, Conan received a mysterious invitation. The cover of the invitation had no sender's information, only a strange badge pattern.
Conan opened the invitation, and its contents made him frown.
"Dear Mr. Conan, I am well aware of your exceptional talent in solving criminal cases. I now invite you to an ancient castle to uncover a secret hidden for many years. If you succeed, you will save countless lives."
Ran Mouri leaned closer and asked curiously, "Conan, what does this mean?"
Conan shook his head: "I don't know, but I feel like things aren't simple."
When Lin Yu and Ai Haibara learned of this, they both felt that the matter was strange.
“No matter what, we can’t just ignore this,” Ai Haibara said.
After discussing it, everyone decided to go to the castle mentioned in the invitation.
When they arrived at the castle, they were awestruck by its magnificent yet eerie appearance. The castle gates were tightly shut, and a mysterious mist shrouded the area.
Conan stepped forward and knocked on the door. The door slowly opened, and a butler-like person appeared in front of them.
"Welcome, everyone. Please follow me." The butler's voice was deep and cold.
They followed the butler into the castle, whose decorations were ancient and luxurious, yet exuded an eerie atmosphere.
"Where is the owner of this castle?" Ran Mouri couldn't help but ask.
The butler did not answer, but silently led them to a room.
"The master is waiting for you inside." With that, the butler turned and left.
Conan cautiously pushed open the door. The room was dimly lit, and a figure sat in a chair with his back to them.
"You've finally arrived." The figure slowly turned around; it was an old man with a haggard face.
"Who are you? Why did you invite us here?" Conan asked.
The old man sighed: "My name is Edward. This castle hides a terrible curse. Over the years, many members of my family have died mysteriously, and I suspect it is related to a treasure in the castle."
"Treasure?" Lin Yu said in surprise.
The old man nodded: "Legend has it that this treasure is cursed, and anyone who covets it will suffer misfortune."
Conan and his friends begin their investigation inside the castle. They discover that the castle contains many hidden passages and secret rooms.
In a locked room, they found some strange documents and items.
“These seem to be related to some kind of mysterious ritual,” Ai Haibara said.
Meanwhile, strange things keep happening in the castle. Eerie crying sounds often drift through the night, and objects inexplicably move.
Ran Mouri was a little scared: "What on earth is going on?"
Conan calmly analyzed, "This might be someone deliberately creating a terrifying atmosphere to prevent our investigation."
During their continued exploration, they encountered a mysterious woman.
"You shouldn't be here. Leave now!" the woman said before disappearing.
Conan felt that this woman must know something.
Following the woman's clues, they arrived at the castle's basement.
The basement reeked of decay, and the walls were covered with strange symbols.
"There must be a crucial secret hidden here," Conan said.
Just as they were observing carefully, they suddenly heard the sound of a mechanism being activated...
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