Set in 17th-century England, this chilling tale follows corrupt official Matthew Hopkins (Vincent Price), who claims an ability to discover witches. But he uses his power to gain money and favors from people he's fingered in return for declaring them innocent. When he arrests and tortures Father Lowes (Rupert Davies), Lowes's niece's fiancé (Ian Ogilvy) decides to put an end to Hopkins's sleazy practices and goes on a quest to seek vengeance.