Edward G. Robinson

In 1938, Walter Neff, an experienced salesman of the Pacific All Risk Insurance Co., meets the seductive wife of one of his clients, Phyllis Dietrichson, and they have an affair. Phyllis proposes to kill her husband to receive the proceeds of an accident insurance policy and Walter devises a scheme to receive twice the amount based on a double indemnity clause. When Mr. Dietrichson is found dead on a train track, the police accept the determination of accidental death. However, the insurance analyst and Walter's best friend Barton Keyes does not buy the story and suspects that Phyllis has murdered her husband with the help of another man.

Rico is a small-time hood who knocks off gas stations for whatever he can take. He heads east and signs up with Sam Vettori's mob. A New Year's Eve robbery at Little Arnie Lorch's casino results in the death of the new crime commissioner Alvin McClure. Rico's good friend Joe Massara, who works at the club as a professional dancer, works as the gang's lookout man and wants out of the gang. Rico is ambitious and eventually takes over Vettori's gang; he then moves up to the next echelon pushing out Diamond Pete Montana. When he orders Joe to dump his girlfriend Olga and re-join the gang, Olga decides there's only one way out for them.