马洛（迪克·鲍威尔 Dick Powell 饰）是一名独来独往的私家侦探，某日，马里特（Douglas Walton 饰）找到了马洛聘他当自己的保镖，结果马洛却莫名其妙的挨了一顿打。之后，一个叫安（安妮·雪莉 Anne Shirley 饰）的女孩现身，她告诉马洛，他所遭遇的一切和她的继母格雷尔夫人及其所拥有的翡翠有着千丝万缕的关联。对翡翠深感好奇的马洛决定将这一连串的事件调查个水落石出。
在安的协助下，马洛对事件的全貌渐渐的有了了解，而隐藏在背后的，是安的父亲（迈尔斯·曼德 Miles Mander 饰）。不仅如此，不久之前，马洛受雇寻找一个名叫维尔马的女子的下落，这名女子竟然也被牵连进了翡翠的案件之中。

In 1918, an English family is terrorized by a vampire, until they learn how to deal with it. They think their troubles are over, but German bombs in WWII free the monster. He reclaims the soul of his wolfman ex-servant, and assuming the identity of a scientist who has just escaped from a concentration camp, he starts out on a plan to get revenge upon the family.

'A woman reporter is blackmailed for knowledge of freed suspect's involvement in a murder.' (British Film Institute)

A houseguest at an upper-class gathering, wealthy Jew Ferdinand de Levis, is robbed of £1,000 with evidence pointing towards the guilt of another guest, Captain Dancy. Instead of supporting De Levis, the host attempts to hush the matter up and when this fails, he sides with Dancy and subtly tries to destroy de Levis' reputation. When Dancy is later exposed, and commits suicide, de Levis is blamed for his demise.