When an employee at an illegal gambling den dies suspiciously, her sister, Nancy, looks into the situation and falls for Johnny O'Clock, a suave partner in the underground casino. Selfish and non-committal by nature, Johnny slowly begins to return Nancy's affection and decides to run away with her, but conflict within his business threatens their plans. As Johnny tries to distance himself from the casino, his shady past comes back to haunt him.
Dick Powell
Evelyn Keyes
Lee J. Cobb
Ellen Drew
Nina Foch
Thomas Gomez
John Kellogg
Jim Bannon
Mabel Paige
Phil Brown
Fred Aldrich
George Alesko
John P. Barrett
Fred Beecher
Brooks Benedict
John Berkes
Jeff Chandler
Gene Delmont
Johnny Duncan
Matty Fain
Virginia Farmer
Victoria Faust
Adolph Faylauer
Jerry Frank
Ralph Freedman
Raoul Freeman
Dick Gordon
Jesse Graves
Kit Guard
Robert Haines
Joe Helper
Al Hill
Kenner G. Kemp
Pat Lane
George Lloyd
Cy Malis
Edward Margolis
Charles Marsh
Allen Mathews
Thomas H. O'Neil
Bob Perry
Charles Perry
Robin Raymond
Shimen Ruskin
Carl Saxe
Jeffrey Sayre
Cy Schindell
Sammy Shack
Jack C. Smith
Charles St. George
Bert Stevens
Bill Stubbs
Brick Sullivan
Ralph Volkie
Charles Wexler
George Zouzaniles
Charles Mueller
Kenneth MacDonald