A martial arts master/detective investigates a series of murders and helps a deaf bathhouse attendant, Hisako.

A cop, Katayama, gains the trust of a mother and daughter whose father, Nishina, is missing after being accused of killing a gang boss.

Karate expert Katayama (Takeda) investigates the robbery of a bank in Hokkaido, where an apple seed left at the scene holds the answer to the robbers' whereabouts.