S1·E136 The Old Blue Castle Investigation Case (1)
Aired February 22, 1999 25 min ★ 7.5/10 · 2 TMDB votes
Synopsis
The Detective Boys are on a camping trip but Dr. Agasa forgot the tent. They wander to a castle owned by Masuyo Mamiya, meet Katsuo Tabata, Mitsuru Mamiya, Takahito Mamiya, and learn that there's a secret treasure somewhere inside.
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