Locked in her cell, a murderer reflects on the events that have led her to death row.
Tells the story of one day in the lives of the various people who populate a police detective squad. An embittered cop, Det. Jim McLeod, leads a precinct of characters in their grim daily battle with the city's lowlife. The characters who pass through the precinct over the course of the day include a young petty embezzler, a pair of burglars, and a naive shoplifter.
War heroes Rip Murdock and Johnny Drake are sent to Washington, D.C, to receive top honors for their service. Johnny, seemingly terrified by the publicity that awaits him, jumps off the train and later turns up dead. Suspecting foul play, Rip begins digging into his pal's past. He encounters cover-ups, threats to his own life and deadly femme fatale Coral Chandler.
After a former model is drowned in her bathtub, Detective James Halloran and Lieutenant Dan Muldoon attempt to piece together her murder.
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.
Stroud, a crime magazine's crusading editor has to post-pone a vacation with his wife, again, when a glamorous blonde is murdered and he is assigned by his publishing boss Janoth to find the killer. As the investigation proceeds to its conclusion, Stroud must try to disrupt his ordinarily brilliant investigative team as they increasingly build evidence (albeit wrong) that he is the killer.
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, he tries to track down his old identity, stumbling into a 3-year old murder case and a hunt for a missing $2 million.
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.
A fatally shot female gangleader recounts her sordid life of crime to a police officer just before she dies.
Londoner Harry Fabian is a second-rate con man looking for an angle. After years of putting up with Harry's schemes, his girlfriend, Mary, becomes fed up when he taps her for yet another loan.
Chronicles the rise and fall of the organised crime syndicate known as Murder, Incorporated, focusing on powerful boss Lepke and violent hit man Reles.
Claude is a ruthless and efficient contract killer. His next target, a woman, is the most difficult.
Frank Bigelow is about to die, and he knows it. The accountant has been poisoned and has only 24 hours before the lethal concoction kills him. Determined to find out who his murderer is, Frank, with the help of his assistant and girlfriend, Paula, begins to trace back over his last steps. As he frantically tries to unravel the mystery behind his own impending demise, his sleuthing leads him to a group of crooked businessmen and another murder.
Roustabout Stanton Carlisle joins a traveling carny and unsuccessfully schemes to figure out the mind-reading act of Mademoiselle Zeena and her alcoholic husband, Pete.
When a young woman's skeletal remains turn up on a Massachusetts beach, Barnstable cop Peter Moralas teams with Boston police and uses forensics, with the help of a Harvard professor, to determine the woman's identity, how she died, and who killed her.
A tabloid editor assigns a young reporter to solve a murder the editor committed himself.
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...