On the Caribbean island of Puerto Nueva, a disparate group of individuals await a Boeing 314 Clipper, the Caribbean Clipper that will take them to Miami. Tony Bronson is the new purser for the flight who disrupts the robbery of New York journalist Jim Halsey at their hotel. Halsey is a passenger on the same flight, flying to the U.S.
Bill Fenwick (Richard Dix) is a criminal defense attorney who's near the top of his career, wealthy from defending gangsters and getting them off. Visited by his brother George (Owen Davis, Jr.), an agent for the Justice Department, he appears outwardly indifferent to his brother's chastisements for gaining success and notoriety by being on the wrong side of the law. Beneath it, though, he is troubled, and immediately splits up with his amoral gold-digging trophy girlfriend Judy (Sheila Terry) .
An undercover police agent hopes to provoke, and catch, an international jewel thief, as he transports the famous Karenina diamonds from Paris across Europe to Istanbul on the Orient Express, along with a trainload of suspicious characters.
A mild-mannered clerk, George Chedworth, is married to the snobbish, nagging Julie, and has four children: gambling addict Arthur, beautiful Gwen, teenage singer Susie and young Fred. Chedworth lends money to Arthur to cover his gambling debts to a bookmaker, and is persuaded by the bookmaker on a long-shot wager. Chedworth is then fired from his job after 24 years of service.
Mike Curran believes his son Grant is an effete aesthete and decides to toughen him up by sending him under a false name to work at one of Mike's logging camps. Unknown to the elder Curren, his son spends his evenings as a masked wrestler; Grant believes his family would be embarrassed if they knew the truth. Also unknown to Mike Curran is the fact that his friend and logging camp boss Ben Morton and his stooge Paul Sangar are embezzling money from the Curren owned camp and are trying to force Peggy O'Shea's rival logging camp out of business by deadly acts of sabotage.
Dr. MacAuley, a kindly beloved country doctor, is sent to Fillmore Prison. His crime was for removing a bullet from a young man who was escaping from the police.
A wisecracking newspaper reporter comes up with what he believes to be the ultimate publicity stunt: have the newspaper offer a $5000 prize to whoever can find Jimmy Valentine, a once notorious safecracker who seemed to have just disappeared from the scene, supposedly retired, but the reporter decides to try to collect the prize himself.
John 'Captain' Martin is a sailor who gets involved with a drug ring when he finds a package on a harbour containing their stolen goods. He meets with a detective and rounds up the hoodlums.
After Tony Gambini and his family acquire a wrecked car, they fix it to use as a race car with Ted Rogers as the driver. Rogers competes against Skid, who was partially responsible for the death of Rogers' father at a race. During the last race, Rogers wins after Skid crashes into a wall after remembering Rogers' father.
Gangster melodrama concerns a stolen bonds and securities racket and an unethical young lawyer who gets entangled with the underworld but ultimately comes down on the side of right by trying to defend an innocent man and helping to bring the gangster and his colleagues to justice.
When the boys are on their way home from a masquerade party when they hear noises in a warehouse and investigate. The warehouse is being robbed and the boys are captured by the police and wrongly convicted of robbery. Their lawyer Gabe is able to reduce the sentence to just probation, but Slip insists that he and Sach should accept jail time to determine who is behind the series of robberies in the neighborhood.
Tip Morgan's teenaged daughter Linda is upset because her alcoholic father is drinking inside a bar and has a heart condition. Tip, a widower and a former newspaper crime reporter, moved to Mexico many years ago without explanation. Trying to make amends for his behavior, Tip gets in touch with Dave Brady, a crime novelist he admires.
After being condemned to death, a man recounts the events that have brought him there. A struggling Brixham fisherman, he was persuaded by an Australian chancer to switch to smuggling brandy from the French coast. However the murder of a policeman rapidly leads to things falling apart.
Although publishing a newspaper has made him a success, Sam Winston is so unhappy in his home life that when he meets Johnny April, a criminal just out of jail, he asks Johnny to kill him and offers $25,000. Sam tells a confused Johnny that he doesn't have the nerve to commit suicide, so he will pay Johnny to do the job. Taking a few days to get to know his victim, Johnny discovers the reasons for Sam's unhappiness.
While researching an ordinary real estate transaction, title examiner Leah Farrell (McCormick) discovers a property transfer document with the forged name of a missing woman, and proceeds to investigate. When she is threatened by gangsters for snooping around, she turns for help to Assistant District Attorney Paul Shaughnessy (Atkins). As Paul tries to protect Leah from the danger that looms from all sides, romance blooms.