After defeating the shadowy figure, Conan and the others continued their search for clues inside the museum.

"The emergence of this mysterious organization has made things even more complicated," Lin Yu said.

Ai Haibara carefully observed the traces left by the shadowy figure: "But their actions seem very targeted."

Conan pondered for a moment: "Let's tell the police about the situation here first, and then start our investigation from that sign."

Police arrived quickly and conducted an investigation at the scene.

Conan and the others returned to Professor Agasa's house and began searching online and in various sources for information related to the symbol.

After several days of effort, they finally made some discoveries.

“This symbol belongs to an organization called the ‘Shadow League,’ which is said to be involved in various illegal activities in the shadows,” Conan said.

Ran Mouri asked in surprise, "Then why would they be interested in these thefts?"

Nightshade analyzed, "Perhaps those stolen items have a special purpose for them."

Just then, Dr. Agasa received a mysterious email.

"What is this?" Lin Yu asked.

Dr. Agasa opened the email, which contained a blurry video.

The video appears to show a hidden basement filled with various stolen items.

“This could be an important clue!” Conan said.

Based on some details in the video, they began searching for the location of the basement in the city.

After some twists and turns, they finally found the entrance in a remote corner.

"Everyone be careful," Conan warned.

They cautiously entered the basement, which was filled with an old, musty smell.

The basement was filled with various boxes. Conan opened one of them, and inside were the items that had been stolen earlier.

“Looks like we’ve come to the right place,” Ran Mouri said.

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

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

A group of men in black rushed in and engaged in a fierce battle with Conan and his friends.

Using the basement environment, Conan skillfully evaded the enemy's attacks and looked for an opportunity to counterattack.

Ran Mouri used her karate skills to defeat her enemies one by one.

Lin Yu's high-tech equipment also played a significant role, throwing the enemy into chaos.

Ai Haibara stood in the corner, her clear and sharp eyes calmly scanning everything around her. Her petite figure seemed to blend into the tense situation, yet she appeared exceptionally independent and composed. She remained vigilant, closely monitoring every subtle change, so that she could provide the most timely and effective support to everyone at crucial moments.

After a fierce struggle, everyone worked together, utilizing their individual strengths and wisdom, and finally succeeded in subduing all the enemies dressed in black. The scene was a mess, with traces of the fight and scattered items everywhere.

"Phew... It's finally over!" Lin Yu gasped for breath, his hands on his knees, sweat dripping from his forehead. He was exhausted, but a relieved smile appeared on his face. After all, this victory had not come easily.

Conan didn't relax for a moment. He quickly got up and went to every corner of the basement, carefully examining every item inside. He knew that the purpose of this operation was not only to defeat these men in black, but more importantly, to gather as many clues as possible about the "Shadow Alliance" in order to uncover the huge conspiracy hidden behind this mysterious organization.

Just then, Ai Haibara, who had been silently searching, suddenly shouted, "Look, there's a document here!" Hearing her voice, Conan rushed over, took the document, and quickly began to read it. The document detailed some of the "Shadow Alliance's" plans and a list of its members, which was undoubtedly a major discovery.

"Great! With these, we can learn more about this organization!" Conan exclaimed excitedly, his eyes gleaming with determination. However, their joy didn't last long, because just as they were about to leave the basement with the precious document, a deafening roar of a car engine suddenly came from outside.