Jimmy was a ace detective and was able to solve crimes like no one else. On one case though, he was slipped some poison. What happened after is a mystery in itself! What has happened to Jimmy?
In a mansion where a party has been interrupted by a murder: one of the guests, President Yamazaki of Yatsubishi Bank, was found dead with a bullet in his heart. The police have been investigating the crime scene, but have no conclusive evidence as to who the killer is. However, Shinichi Kudo makes his grand entrance and claims that he has figured out the case.
Later, Ran Mouri meets up with her friend Shinichi Kudo on their way to school. After Shinichi explains to Ran why he quit the soccer team and tells her that he wants to become a detective like the fictional Sherlock Holmes, Ran reminds Shinichi of a promise he made with her: if Ran won the regional karate championship, Shinichi would go with her to the amusement park. After school, they go to Tropical Land and get in line for the Mystery Coaster. Shinichi demonstrates his deductive reasoning to Ran when he correctly deduces that a girl standing in line in front of them is a gymnast. Shinichi and Ran's date is cut short when a murder occurs while they're riding the roller coaster. shinichi figures out the murderer as gymnast.
After the case Shinichi spots two suspicious black-clothed men. He decides to follow them and witnesses a deal taking place but is attacked from behind. The two men, intending to kill him, force him to swallow newly developed poison.