Ep. 403: Detective Boys assist orphan Yuriko with a riddle at her great-grandfather's mansion.
Aired on June 20, 2005Filler

403
The Detective Boys and Conan meet Yuriko, an orphaned girl who is a potential heiress to her great-grandfather's fortune. She must solve a riddle to claim the inheritance. 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.
Episodes
- Ep. 399 · The Weird Family's Commission Part 2
- Ep. 400 · Ran discovers the four-digit lock code on Conan's phone and confronts him about his secret.
- Ep. 401 · Detective Boys witness a jewelry store robbery that results in a suspect's fatal fall from a roof.
- Ep. 402 · The Red-Handed Jewel Robber Part Two Continues
- Ep. 403 · Detective Boys assist orphan Yuriko with a riddle at her great-grandfather's mansion.
- Ep. 404 · Detective Boys navigate labyrinth using yarn and Conan solves riddle with shadow
- Ep. 405 · Jogger becomes suspect after finding body and running for help, leading to a mystery solved by Takagi and Conan.
- Ep. 406 · Conan and Heiji's Reasoning Magic: The Trick
- Ep. 407 · Conan and Heiji investigate Tenko's murder in the mansion archive room