The impaled man in a mask turns out to be Tokio Ebara, a computer hacker. There are several suspects related to Tokio, with a lack of solid alibis. The Night Baron appears once again and Ran engages him in karate, but he manages to foil her kick! Conan finds a clue that leads him towards solving the case.

Kudo Shinichi is a seventeen year-old high school detective whom people call the "Modern Sherlock Holmes." However, one night after a date with his childhood sweetheart, Ran, Shinichi witnessed an illegal trade and, caught off his guard, was knocked unconscious and fed a drug that was supposed to kill him... but he woke up and found himself shrunken to a seven year-old. In order to track down the men who did this to him, Shinichi hid his identity and lived with Ran, whose father happened to be a hopeless detective, and with that came a series of murders and mysteries that he must solve.