故事发生在十二世纪中期，帕斯伯亲王（文森特·普莱斯 Vincent Price 饰）因为信奉邪恶的撒旦而对当地的农民实行重税制度，使得当地居民们苦不堪言。帕斯伯亲王十分喜爱一位名叫弗兰西斯卡（珍·爱舍 Jane Asher 饰）的女子，为了逼迫她就范，帕斯伯亲王不惜逮捕和拘禁了范的父亲，同时被拘禁的还有当地的农民领袖吉诺（David Weston 饰）
朱利安（哈泽尔·考特 Hazel Court 饰）苦苦的恋慕着亲王，却无法得到他的任何回应。于是，朱利安决定帮助范的父亲和吉诺越狱，不幸的是，计划失败了。范的父亲企图刺杀亲王，却反被杀死，幸存的吉诺遭到了流放。危险的红死病在乡间蔓延开来，吉诺遇见了一个神秘的红衣人，在红衣人的帮助下，他展开了他的复仇大计。
Jack Lyons is interrogated by the police. He accidentally reveals himself as a murderer when he identifies a crocodile dressing case and the initials engraved on it. Since the initials were engraved on it shortly before the murder and fell off during the murder, only the killer and victim could have known about them. Jack is promptly arrested.
A slick young man buys a jewel with a cheque that bounces. He then disappears and both the police and a lawyer try to find him. The lawyer hires a female detective to track down the missing man, but when his body is found in the Thames the case is by no means over.
