Conan stepped forward, attempting to pick up the crystal, but felt a powerful resistance. The masked man, who had somehow followed him in, saw the crystal and a mad glint flashed in his eyes.

"This is my power!" Ignoring Conan and the others' attempts to stop him, the masked man charged toward the crystal.

However, the moment he touched the crystal, the dark power backfired, and the masked man screamed in agony. Seeing this, Conan knew he couldn't let the crystal continue to exist. He mustered his courage, concentrated all his strength, and grasped the crystal.

The moment Conan grasped the crystal, he felt a powerful dark force trying to invade his body, but he resisted it with unwavering willpower.

"Conan!" Ran Mouri and the others called out anxiously.

Conan gritted his teeth and said to his friends, "I'm fine. Quick, help me purify this power!"

Nightshade, Lin Yu, and Ai Haibara quickly surrounded Conan, transferring their power to him. With everyone's combined efforts, Conan successfully purified the dark power within the crystal.

As the dark power dissipated, the crystal shattered, and the space of light gradually disappeared. They returned to the stone chamber, which had now returned to tranquility.

"It's finally over." Ran Mouri breathed a sigh of relief.

Conan smiled at everyone and said, "Thanks to everyone's joint efforts, we successfully averted a crisis."

They left the mysterious island, filled with the joy of victory. Upon returning to the city, they were warmly welcomed and praised. However, Conan knew that more challenges awaited them, but he and his companions were ready to fight for world peace and justice at any time.

Back in the city, Conan and his friends didn't bask in the joy of victory, but remained vigilant. They knew that the forces of darkness could reappear at any moment.

One day, Conan received an anonymous letter. The contents of the letter made his expression serious.

"There's a new development," Conan said to his friends.

The letter mentions a series of bizarre thefts in the city. The stolen items seem unrelated, but investigation reveals they are all connected to an ancient legend. The legend says that collecting these items can awaken a powerful force that could once again bring crisis to the world.

“It seems we’ll have to start a new investigation,” Ran Mouri said, her eyes revealing determination.

Conan nodded: "This case may be more complicated than we imagined, but we will definitely be able to solve the mystery and stop the evil forces' conspiracy."

Thus, Conan and his friends once again embarked on their journey to uncover the truth, traversing the city's streets and alleys, searching for every possible clue. During their investigation, they discovered that a vast criminal organization seemed to be hiding behind these thefts, an organization that operated clandestinely, leaving almost no trace after each crime.

"This organization is not simple; we must proceed with caution," Conan warned.

They started by investigating the origin of the stolen items, discovering that they came from some ancient families in the city. Conan and his friends decided to visit these families, hoping to obtain more information from them.

During a visit to an ancient family, the patriarch told them a story about the family's heritage. It was said that the stolen items were once tools used by the family to seal away some kind of evil force, and their theft could potentially trigger a great disaster.

“We must retrieve these items as soon as possible and reseal that evil power,” Conan said.

As the investigation deepened, they gradually pinpointed a criminal organization's hideout. However, this hideout was heavily guarded, surrounded by various traps and surveillance equipment.

"How are we going to get in?" Lin Yu frowned as he looked at the stronghold's defensive facilities.

After thinking for a moment, Conan said, "We need to come up with a detailed plan to exploit their defensive vulnerabilities and sneak in quietly."

So, Conan and his friends began gathering more information about the hideout, analyzing the patterns in the defense system, and preparing for a surprise attack. During their preparations, they encountered some difficulties, such as how to avoid surveillance equipment and how to deal with potential traps. But Conan and his friends, with their wisdom and courage, overcame these difficulties one by one.

Finally, on a dark and stormy night, Conan and his friends began their operation. They cautiously approached the hideout, avoiding surveillance equipment and traps as planned. However, just as they were about to enter the hideout, an alarm suddenly went off.

"Oh no, we've been discovered!" Nightshade exclaimed.

Suddenly, a group of men in black rushed out of the stronghold and surrounded Conan and the others.

"It seems a fierce battle is inevitable." Ran Mouri clenched her fists, her eyes filled with fighting spirit.

Conan looked at the enemy in front of him and calmly said, "Everyone, don't panic. If we follow our previous training and cooperate well, we will definitely be able to break through the encirclement and retrieve the stolen items!"

A fierce battle erupts outside the stronghold. Will Conan and his friends be able to break through the enemy's defenses, recover the stolen items, and prevent the resurgence of evil forces? What challenges will they face? Everything remains to be seen…