Robert Evans is a revivalist preacher who is desperate for money to build his own church. He romances a rich woman named Naomi Freshwater and kills her. Some time later, Robert meets Naomi's neice Laura. He tries to romance her as well, but she is not interested. When Laura discovers that Robert killed her aunt, the preacher kills her and stuffs her body in a trunk. He drags the trunk to a pit and sets it on fire. Later, as Robert is delivering a sermon, it begins to rain. The rain puts out the fire and the contents of the burned trunk are revealed. Robert is promptly arrested and charged with murder.

Grace Renford is a wealthy and attractive woman who is interested in meeting a man who will love her, not for her money, but for what she is. So she pretends to be a middle class woman after corresponding with a young engineer named Keith Holloway, who she met through an ad in a spiritualism magazine.

Ned Murray is a lawyer who gets Lew Rydell off on a murder charge, but later learns that he is guilty. Knowing that Lew cannot be tried twice for the same crime, Ned seeks out other ways to bring the man to justice. He talks to a gangster Tony Hardeman who misinterprets Ned's concern and decides to have Lew killed. Ned suspects that a murder is about to take place and tries to save Lew. He arrives at Lew's house too late and discovers that Lew is still alive. He managed to kill Tony before he could kill him. Ned realizes that he can now have Lew sent to prison since he can now be tried for another murder. Guilt overwhealms him, however, and Ned decides to defend Lew in court once again.

Rusty Connors is a con man that has just been released from prison. He looks up the wife of his dead former cellmate, a robber and murderer, named Miles Krause. Before he was imprisoned, Krause stole a significant amount of money and killed his partner. The money and the body, however, never turned up. Connors talks to Krause's wife Helen and hopes that she knows where the money is. She, however, does not have a clue. Eventually, however, they are able to figure out that the money is stored in an abandoned boathouse that is now infested with rats. In the boathouse, they find the money and the dead and half-eaten body of Krause's partner. When Connors sees the money he is overcome with greed and tries to murder Helen. She manages to knock him out. When Connors awakens, he finds himself bound and gagged and being taunted by Helen. She gets up to leave with the money, but is tripped by Connors and is impaled on a hook. As she dies, the scent of her blood attracts the rats.

Arthur Mannix is a photographer and Hiram Price is an undertaker. Both hide behind their respective professors to conceal another profession: hired killer. Each man has the same boss who gives each an order to eliminate the other.