The Narrow Margin
The Narrow Margin is a 1952 American film noir starring Charles McGraw and  Marie Windsor. Directed by Richard Fleischer, the RKO picture was  written by Earl Felton, based on an unpublished story written by Martin Goldsmith and Jack Leonard. The screenplay by Earl Felton was nominated for an Academy Award. A police detective plays a deadly game of cat-and-mouse aboard a train with mob assassins out to stop a slain gangster's widow before she can testify before a grand jury.