The year is 1877. Johnny Ketchum| son of notorious gunfighter Ace Ketchum| seeks the man who killed his mother. His search brings him into contact with (1) DeputyMace Fenton| who wants to collect the $10|000 reward on Ace Ketchum's head| (2) wealthy landowner Don Pedro Fortuna and his daughter Pilar; and (3) Juan Morales| aMexican bandit. Before finishing his quest| Johnny finds love| learns family secrets| and fights in a battle.