During the English Civil War, Matthew Hopkins (Vincent Price) is appointed "Witchfinder General" by the Puritans under Cromwell and empowered to travel the countryside with his henchman, Stearne (Robert Russell), collecting a fee for each witch from whom he extracts a confession. They ride
into one town where the village priest, Lowes (Rupert Davies), is accused. They proceed to torture him by driving steel spikes into his flesh, looking for "the devil's mark." Sara (Hilary Dwyer), Lowes's niece, offers herself to the pair, but Stearne just rapes her and hangs her uncle anyway.
Marshall (Ian Ogilvy), her fiance, a soldier with the Royalists, has sworn to protect he...