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Kogoro, Ran, and Conan visit with an old woman and her grandson, but when they arrive he's found dead in a locked bathroom.
Sonoko appears to be the killer's target. Can Sonoko be saved in time? Who is there to help Conan?
Detective Sato pursues a possible murderer through a building and accidentally handcuffs herself and the culprit to a toilet. It's up to Takagi and the Detective Boys to help.