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.
Reformed parolee Steve Lacey is caught in the middle when a wounded former cellmate seeks him out for shelter. The other two former cellmates then attempt to force him into doing a bank job.
A crooked politician finds himself being accused of murder by a gangster from whom he refused help during a re-election campaign.
A seductive woman gets an innocent professor mixed up in murder.
Nick Garcos comes back from his tour of duty in World War II planning to settle down with his girlfriend, Polly Faber. He learns, however, that his father was recently beaten and burglarized by mob-connected trucker Mike Figlia, and Nick resolves to get even. He partners with prostitute Rica, and together they go after Mike, all the while getting pulled further into the local crime underworld.
Rose Loomis and her older, gloomier husband, George, are vacationing at a cabin in Niagara Falls, N.Y. The couple befriend Polly and Ray Cutler, who are honeymooning in the area. Polly begins to suspect that something is amiss between Rose and George, and her suspicions grow when she sees Rose in the arms of another man. While Ray initially thinks Polly is overreacting, things between George and Rose soon take a shockingly dark turn.
Army Lieutenant Halliday, accused of stealing the Army payroll, pursues the real thief on a frantic chase through Mexico aided by the thief's ex-girlfriend and is in turn being chased by his accuser, Capt. Blake.
George Taylor returns from WWII with amnesia. Back home in Los Angeles, while trying to track down his old identity, he stumbles onto a three year old murder case and a hunt for a missing $2 million.
Duke Berne, former big shot but now a three-time loser, fears returning to crime because a fourth conviction will mean a life sentence. Finally, haunted by his past and goaded by his cohorts, he joins in planning an armoured car robbery.
Art curator George Steele experiences a train wreck...which never happened. Is he cracking up, or the victim of a plot?
Joe Sullivan is itching to get out of prison. He's taken the rap for his accomplice Rick, a sadistic mobster who owes him $50,000 from the job they pulled. Rick sets up an escape for Joe, assuming that Joe will be killed while fleeing. But with the help of his love-struck girl Pat and his sympathetic legal caseworker Ann, Joe gets further than Rick intended...
Two U.S. Treasury ("T-men") agents go undercover in Detroit, and then Los Angeles, in an attempt to break a U.S. currency counterfeiting ring.
An unemployed drifter, Eric Stanton wanders into a small California town and begins hanging around the local diner. While Eric falls for the lovely waitress Stella, he also begins romancing a quiet and well-to-do woman named June Mills. Since Stella isn't interested in Eric unless he has money, the lovelorn guy comes up with a scheme to win her over, and it involves June. Before long, murder works its way into this passionate love triangle.
Pépé le Moko, one of France's most wanted criminals, hides out in the Casbah section of Algiers. He knows police will be waiting for him if he tries to leave the city. When Pépé meets Gaby, a gorgeous woman from Paris who is lost in the Casbah, he falls for her.
Nick Cochran, an American in exile in Macao, has a chance to restore his name by helping capture an international crime lord. Undercover, can he mislead the bad guys and still woo the attractive singer/petty crook, Julie Benson?
When newlyweds visit Las Vegas, the wife's shady past comes to the surface.
It's a deadly play for power when a Mafia chieftain's top gun goes straight and threatens to testify against the big boss and his cruel, nationwide network of crime. The picture, which was shot in a semi-documentary style, was inspired by the Kefauver investigations of 1950-51.
An ambitious Mexican-American gets mixed up with the neurotic wife of his casino boss.
Detective Kyle Bodine falls for Rachel Munro who is trapped in a violent marriage. After she shoots her husband, Kyle relucantly agrees to help hide the body, but his partner is showing an unusual flair for finding clues.
A Brooklyn pier racketeer bullies boat-owners into paying protection money but two fed-up fishermen decide to eliminate the gangster themselves rather than complain to the police.