The Phantom Doctor

Fed up with those meddling kids from the Boy Detectives Club, the Fiend with Twenty Faces plans to exact his revenge and walk off with a priceless work of art in the bargain! Pursuing them through haunted houses and limestone caverns, the Fiend lures master sleuth Kogoro Akechi and the members of the Boy Detectives Club deep underground for a life-or-death struggle in the dark.