故事发生在南北战争结束之后,从前线退下来的老兵霍华德(詹姆斯·斯图尔特 James Stewart 饰)想要回到故乡,重新过上宁静的生活。可是到达目的地后他才发现,原本应该属于自己的土地,早已被他人侵占,想要赎回土地,霍华德必须付出一笔不小的代价。 身无分文的霍华德决定当一名赏金猎手来赚取外快,他将目标放到了大盗本(罗伯特·瑞安 Robert Ryan 饰)的身上。在捉拿罗伯特的过程中,霍华德结识了两名帮手罗伊(拉尔夫·米克 Ralph Meeker 饰)和杰西(米勒德·米切尔 Millard Mitchell 饰),两人误以为霍华德是警探,所以愿意无条件的帮助他。可是,当三人捉住了本后,另外的两人才发现了霍华德的真实身份,于是他们提出了瓜分赏金的要求。
The main character is Dr. Max Holst, a successful neurosurgeon. One day an intense little man named Steinmetz shows up, who has the real ability to create objects out of thin air, using only his mind. As no one believes him at first, he is held at a ward for mental patients, but manifests the key to his door and escapes. As he has a special interest in Dr. Holst, Steinmetz subsequently invites Holst to his large mansion, which is full of expensive paintings and sculptures, and proves to him that he can in fact materialise objects. Steinmetz’s abilities are evolving by leaps and bounds, and is progressing from being able to create objects only to being able to create living things. His ultimate ambition is to be able to create a human being. He tells Dr. Holst that if he will only perform a certain brain operation on him, Steinmetz will become able to attain his goal. He’s got all the necessary equipment set up in his basement. Dr. Holst, however, is too spooked by the whole thing to agree to this mad scheme, and refuses. Steinmetz then sets about manipulating Holst’s life, to pressure him into performing the operation. By then Steinmetz has become able to create a temporary human being, and in the hope that he can perhaps make his own creation perform the operation, he manifests a doppelganger of Dr. Holst. This double proceeds to take over Dr. Holst’s life, creating chaos for him professionally and personally. And then Dr. Holst starts fighting back. The ending has the dual virtue of being both unexpected and satisfying.