Conan deduces that the "locked" door was a trick involving a cassette tape and a heavy dictionary.
The story begins with the arrival of a stoic, mature girl named in Conan’s elementary school class. Initially appearing as just another transfer student, she surprises Conan by revealing her true identity after school: she is Shiho Miyano , a former scientist for the Black Organization code-named Sherry . Detective Conan (Dub) Episode 129
While the murder is solved, the victory is hollow. In the chaos of the investigation, the floppy disk containing the drug data is accidentally formatted or lost, destroying Conan’s immediate hope for a cure. Conan deduces that the "locked" door was a
Upon arriving, they find Professor Hirota dead inside a locked room, surrounded by fallen books. The local police initially suspect a tragic accident or a robbery gone wrong. However, Conan’s keen observation skills reveal a much more calculated crime: While the murder is solved, the victory is hollow
She explains that she is the creator of , the very poison that shrunk Shinichi Kudo. After the Organization murdered her sister, Akemi, Shiho took the drug herself to commit suicide but instead shrunk in size, eventually seeking out Shinichi (Conan) for help. The Search for the Disk
Haibara reveals that a floppy disk containing crucial data about the drug—and potentially a cure—might be hidden at the home of , a university teacher she once stayed with. Conan, sensing a chance to regain his true form, rushes with Haibara and Professor Agasa to the professor's house. The Murder Case