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The Detective Boy's have 24 hours to help a girl solve a riddle for her inheritance: "When the bull loses its horns, and his tail becomes his head. The angel will come down and play the horn. That melody is my treasure."
The thief jumps off the room, apparently killing himself, but Conan notices something strange about the incident leading him to question the police's deduction.
While solving the first part of the riddle, the Detective Boys are trapped in a labyrinth. Will they solve the riddle in time?