قسط 403: Detective Boys یتیم Yuriko کی مدد کرتے ہیں جو اپنے پر دادا کے محل میں ایک معمے کو حل کر رہی ہے۔

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The Detective Boys and Conan meet Yuriko an orphaned girl. She is a potential heiress to her great-grandfather's fortune, but she must first solve a riddle. Tokei, the man's secretary, instructs her to seek out the Detective Boys' help, and they all gather at the mansion. At 9:00pm he announces the riddles: "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." They have exactly 24 hours in which to solve the riddle. Conan solves the first part of the riddle and finds a black stone, but they fall into a trap which leaves them in a labyrinth. (Source: Wikipedia)