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.

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 .

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: