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.
A charming psychopath tries to coerce a tennis star into his theory that two strangers can commit the perfect crime by exchanging murders—each killing the other’s most-hated person.
Frank Johnson, a sole witness to a gangland murder, goes into hiding and is trailed by Police Inspector Ferris, on the theory that Frank is trying to escape from possible retaliation. Frank's wife, Eleanor, suspects he is actually running away from their unsuccessful marriage. Aided by a newspaperman, Danny Leggett, Eleanor sets out to locate her husband. The killer is also looking for him, and keeps close tabs on Eleanor.
Al Goddard, a detective who works for the United States Postal Inspection Service, is assigned to arrest two criminals who've allegedly murdered a U.S. postal detective.
Young auto mechanic Dan Brady takes $20 from a cash register at work to go on a date with blonde femme fatale Vera Novak. Brady intends to put the money back before it is missed, but the garage's bookkeeper shows up earlier than scheduled. As Brady scrambles to cover evidence of his petty theft, he fast finds himself drawn into an ever worsening "quicksand" of crime.
Wealthy writer Stephen Byrne tries to seduce the family maid, but when she resists, he kills her. Long jealous of his brother John, Stephen does his best to pin the blame for the murder on his sibling. Also affected by Stephen's arrogant dementia is his long-suffering wife Marjorie.
Bart Tare is an ex-Army man who has a lifelong fixation with guns, he meets a kindred spirit in sharpshooter Annie Starr and goes to work at a carnival. After upsetting the carnival owner who lusts after Starr, they both get fired. Soon, on Starr's behest, they embark on a crime spree for cash.
P.C. George Dixon is a long-serving traditional copper who is due to retire shortly. He takes a new recruit under his aegis and introduces him to the easy-going night beat. Dixon is a classic ordinary hero but also anachronistic, unprepared and unable to answer the violence of the 1950s.
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.
Through a fluke circumstance, a ruthless woman stumbles across a suitcase filled with $60,000, and is determined to hold onto it even if it means murder.
When his mother eloped with an Italian opera singer, Louis Mazzini was cut off from her aristocratic family. After the family refuses to let her be buried in the family mausoleum, Louis avenges his mother's death by attempting to murder every family member who stands between himself and the family fortune. But when he finds himself torn between his longtime love and the widow of one of his victims, his plans go awry.
Roy Martin aka Roy Morgan is a burglar and former war-time Radio & Electronics Engineer who listens in to radio police calls, allowing him to stay one step ahead of the cops.
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...
Centring on the activities of a gang of assorted criminals and, in particular, their leader – a vicious young hoodlum known as "Pinkie" – the film's main thematic concern is the criminal underbelly evident in inter-war Brighton.