After successfully solving the case involving a criminal gang involved in human experimentation, Conan and his friends returned to their peaceful lives. However, this peace did not last long.

One day, Conan received a mysterious invitation. The envelope was exquisite and ornate, with an unfamiliar badge printed on it.

"Who could have sent this?" Ran Mouri asked curiously as she leaned closer.

Conan opened the invitation, the contents of which were concise yet mysterious: "Dear Mr. Conan, I am well aware of your exceptional talent in solving mysteries and upholding justice. I cordially invite you to a special gathering at an old manor outside the city. We look forward to your arrival. —The Mysterious Man"

“Something feels off,” Ai Haibara said.

Nightshade frowned: "Could this be a trap?"

Lin Yu, however, was eager to try: "Who cares? We'll find out when we go."

After some discussion, everyone decided to go to that mysterious manor together to find out what was going on.

When they arrived at the estate, they found it to be magnificent and ancient, surrounded by lush gardens and tall trees.

"This place is beautiful, but it always feels a bit mysterious," Ran Mouri said.

They rang the doorbell, and a neatly dressed butler opened the door and welcomed them inside.

Upon entering the manor's main hall, a group of people had already gathered. Conan keenly observed each individual, trying to glean clues from their expressions and actions.

"Welcome everyone." A voice came from the stairs, and everyone looked up to see a man dressed in gorgeous clothes walking down.

“I am the owner of this estate. Just call me Mr. Lawrence,” the man said with a smile.

Mr. Lawrence explained the purpose of the gathering: to uncover a huge secret hidden in the manor.

“My family has been troubled by this secret for many years, and I hope you can help me find the answer,” Mr. Lawrence said.

Mr. Lawrence then assigned tasks to everyone. Conan and the others were assigned to explore the manor's basement.

The basement was dark and damp, filled with an old, musty smell. They walked cautiously, when suddenly they heard a strange sound.

"What's that sound?" Lin Yu asked nervously.

Conan gestured for everyone to be quiet and listen carefully. The sound seemed to be coming from deep within.

They continued walking and found a tightly closed door.

“What we’re looking for might be behind this door,” Nightshade said.

Conan tried to open the door, but found it was locked.

Just then, footsteps sounded behind them.

"Who?" Ran Mouri turned around warily.

A dark shadow flashed by.

"Chase!" Conan shouted.

They chased the shadowy figure in the basement, but the figure was unusually agile and quickly disappeared.

"What exactly is going on?" Ai Haibara asked.

Conan pondered for a moment: "It seems this secret is more complicated than we imagined."

They returned to the door and began searching for a way to open it.

After some effort, the door was finally opened. Inside was a room filled with all sorts of strange instruments and documents.

"What are all these?" Lin Yu asked curiously, picking up a document.

Conan carefully examined the instruments and documents and discovered that they seemed to be related to a mysterious scientific study.

"Could this be the secret of the manor?" Ran Mouri asked.

Just then, an alarm suddenly went off in the room.

"Oh no, we may have triggered some kind of mechanism," Nightshade said.

They quickly left the room with the documents and some important instruments.

However, when they returned to the hall, they found that Mr. Lawrence was missing, and the other guests had all fallen into a coma.

"What's going on?" Lin Yu asked in surprise.

Conan realized something was wrong: "We may have fallen into a huge conspiracy."

Just then, a group of men in black rushed in and surrounded them.

"Hand over what you've taken!" the leader of the men in black said.

Conan and his friends did not back down and engaged in a fierce battle with the men in black.

During the battle, Conan discovers that the men in black seem to have more than just a desire to steal what they have.

“They have other schemes up their sleeves,” Conan said.

After a fierce battle, they finally repelled the men in black.

“We need to get out of here quickly, find Mr. Lawrence, and figure all this out,” Conan said.

They left the manor with the unconscious guest.

On their way back, they discovered they were being followed.

"Looks like the trouble isn't over yet," Nightshade said.

Conan calmly considered a plan: "Let's find a safe place to hide first."

They took refuge in an abandoned warehouse.

"What do we do now?" Lin Yu asked.

Conan looked at the documents and equipment in his hands: "We must unravel this secret as soon as possible to find out the enemy's true purpose."

They began to examine these things closely, and as their research deepened, a startling truth gradually surfaced...