Phillip Raven (Alan Ladd) is an assassin whose latest murder assignment is paid for with counterfeit money by turncoat Willard Gates. Ellen Graham (Veronica Lake), an entertainer and the girlfriend of the police lieutenant who's trying to bring Raven down, is recruited by the government to probe Gates's illegal activities. When Raven happens to meet Ellen on a train, they use their relationship to get what they want -- and exact revenge.