Frank McCloud travels to a run-down hotel on Key Largo to honor the memory of a friend who died bravely in his unit during WW II. His friend's widow, Nora Temple, and wheelchair bound father, James Temple manage the hotel and receive him warmly, but the three of them soon find themselves virtual prisoners when the hotel is taken over by a mob of gangsters led by Johnny Rocco who hole up there to await the passing of a hurricane. Mr. Temple strongly reviles Rocco but due to his infirmities can only confront him verbally. Having become disillusioned by the violence of war, Frank is reluctant to act, but Rocco's demeaning treatment of his alcoholic moll, Gaye Dawn, and his complicity in the deaths of some innocent Seminole Indians and a deputy sheriff start to motivate McCloud to overcome his Hamlet-like inaction.

Two New York City longshoremen Axel Nordmann, an Army deserter and Tommy Tyler, an easy-going freight car loader whose growing friendship is threatened by Charles Malik, a notably repellent punk.

Police Lt. Diamond is told to close his surveillance of suspected mob boss Mr. Brown because it's costing the department too much money with no results. Diamond makes one last attempt to uncover evidence against Brown by going to Brown's girlfriend, Susan Lowell.

'Doc' Riedenschneider, legendary crime 'brain' just out of prison, has a brilliant plan for a million-dollar burglary. To pull it off, he recruits safecracker Louis, driver Gus, financial backer Emmerich, and strong-arm man Dix Handley. At first the plan goes like clockwork, but little accidents accumulate and each partner proves to have his own fatal weakness. In the background is a pervasive, grimy urban malaise.

Romantic, obsessive Steve Thompson is drawn back to L.A. to make another try for Anna, his former wife. However, Anna belongs now to the L.A. underworld. Steve believes he can rescue her, ignoring the advice and warnings of people who would try to save him. He commits himself to a dangerous course of action that quickly takes everyone somewhere unintended.

Joan is the secretary to the public defender in a large city. She is in love with a career criminal named Eddie, and she believes that he is a basically good person who just had some tough breaks. She uses her influence to get him released early, and he tries to go straight after marrying her, but things don't work out, and they both go on the lam.

Harry Fabian is a London hustler with ambitious plans that never work out. One day, when he encounters the most famous Greco-Roman wrestler in the world, Gregorius, at a London wrestling arena run by his son Kristo, he dreams up a scheme that he thinks will finally be his ticket to financial independence. As Fabian attempts to con everyone around him to get his scheme to work, he of course only ends up conning himself. This is an interesting tale of blind ambition, self-deception, broken dreams, and how a man who always thinks he's ahead of the game ends up tripping himself very badly.

Dave Purvis takes pride in being unknown to the law, though famed among fellow crooks as a planner He plots a holdup in meticulous detail; but things go wrong, a cop and two robbers are killed, and Purvis hides out with the money while Lieut. Cordell, friend of the dead cop, investigates. Purvis's new getaway plan shows promise, but may have one tiny flaw.

Dr. Cross, a psychiatrist, is treating a young woman, Janet Stewart, who is in a coma-state, brought on when she heard loud arguing, went to her window and saw a man strike his wife with a candlestick and kill her. As she comes out of her shock, she recognizes Dr. Cross as the killer. He takes her to his sanitarium and urged by his nurse/lover, Elaine Jordan, gives Janet an overdose of insulin. But he can't bring himself to murder her in cold blood and asks Elaine to get the medicine to save her. She refuses, they argue, and he strangles her. He saves Janet's life, but now faces two murder charges.

In pursuit of stolen aircraft engines on a Central American island, federal agent Rigby meets chief suspect Hintten and his wife Elizabeth, a sultry cafe singer; and is watched by Bealer, a "pie-shaped man" with sore feet. Rigby knows he's on the right track when Bealer offers him money to leave Carlota. When Rigby and Elizabeth are drawn to each other, the gang realizes there's more than one kind of bribe. Everybody sweats.

Claude is a young man with a regular job, no history of trouble with the law and no chance of making any real money. He also has the brains and emotional detachment to make the big bucks as a hit man, and that becomes his new job title. A string of successful hits gets him sent to Los Angeles for his latest job. There he is accompanied by two goons: one who is perpetually nervous and the other who quickly worships the young man as a hero. The cold, ruthless hit man finally becomes unglued when he finds out that his latest target is a woman. She's a witness, set to testify against his boss, and guarded day and night by the police. It's her femininity that worries Claude: women are unpredictable, they don't do what you expect. Claude eventually proves that he is the unpredictable one and his own worst enemy.

Cody Jarrett is the sadistic leader of a ruthless gang of thieves. Afflicted by terrible headaches and fiercely devoted to his 'Ma,' Cody is a volatile, violent, and eccentric leader. Cody's top henchman wants to lead the gang and attempts to have an 'accident' happen to Cody, while he is running the gang from in jail. But Cody is saved by an undercover cop, who thereby befriends him and infiltrates the gang. Finally, the stage is set for Cody's ultimate betrayal and downfall, during a big heist at a chemical plant.

Dave Bannion is an upright but unscrupulous cop on the trail of a vicious gang he suspects holds power over the police force. Bannion is tipped off after a colleague's suicide and his fellow officers' suspicious silence lead him to believe that they are on the gangsters' payroll. When a bomb meant for him kills his wife instead, Bannion becomes a furious force of vengeance and justice, aided along the way by the gangster's spurned girlfriend Debbie. As Bannion and Debbie fall further and further into the Gangland's insidious and brutal trap, they must use any means necessary (including murder) to get to the truth.

A frightened woman is running barefoot on a highway, trying desperately to flag a car. After several cars pass her by, the woman sees another car approaching, and to make sure either the car stops - or, she's killed, she stands in the path of an on-coming car. Private Investigator Mike Hammer is the one at the wheel, and after almost hitting the woman, he tells her to get in. The woman's name is Christina Bailey.. She is obviously on the run, being barefoot and wearing nothing but a trench coat, and the scent of fear. Whoever was after her eventually catches up with them. Christina has information they want, but dies while being questioned. The killers fake an accident by pushing Hammer's car off the road, but, he survives, waking up in hospital two weeks later. As Mike starts to investigate Christina's death, he's told by the police to stay out of it, but, the hard-nosed PI proceeds anyways. Little did he know that Christina's secret would lead to death and destruction.

J.J. Hunsecker, the most powerful newspaper columnist in New York, is determined to prevent his sister from marrying Steve Dallas, a jazz musician. He therefore covertly employs Sidney Falco, a sleazy and unscrupulous press agent, to break up the affair by any means possible.

The head of the Green Manors mental asylum Dr. Murchison is retiring to be replaced by Dr. Edwardes, a famous psychiatrist. Edwardes arrives and is immediately attracted to the beautiful but cold Dr. Constance Petersen. However, it soon becomes apparent that Dr. Edwardes is in fact a paranoid amnesiac impostor. He goes on the run with Constance who tries to help his condition and solve the mystery of what happened to the real Dr. Edwardes.