A New York radio personality travels to the small town of Fernville to oversee a contest to identify retired safecracker Jimmy Valentine, believed to be living there under an assumed name. The close-knit town of upstanding citizens is understandably upset by this venture, all the moreso when some of its citizens begin to be murdered. The radio personality and the local newspaper's young daughter collaborate on solving the murders while revealing Valentine, who has become one of the suspects.

A wealthy society doctor decides to research the medical aspects of criminal behaviour by becoming one himself. He joins a gang of thieves and proceeds to wrest leadership of the gang away from its extremely resentful leader.

A British butler goes to America duped by mobsters into believing he is the heir to a fortune.

A millionaire's son works as a milkman for a month to win a bet with his father. While delivering milk he falls in love with a young debutante whom he mistakes for a maid.

A famous singer, bored with music and fans, goes to live in Mexico. His manager sends a woman to bring him back. They fall in love.

John Thompson is kidnapped by mobsters after quitting his job. Then he is arrested, tried, and sentenced to death for murders they committed. A suspicious detective thinks he is innocent and works to save his life.

A noted gunman takes a job on a cattle ranch to stop a band of rustlers.

A woman convicted of fraud aims to take her revenge on the man who put her inside after being released on parole.

After being criticized by the Citizens' League for his inability to cope with a crime wave, Police Captain Haines orders his men in the Homicide Bureau to clean up all their cases, but without violating the constitutional rights of any suspect. Detective Jim Logan is ordered to meet the incoming new-head of the Police Department lab and internal affairs, J.G. Bliss, and takes an instant dislike to her over her attitude toward criminal's rights.

Two men running a carnival airplane ride are hired to fly to retrieve what they think are photos for a reporter. Actually, they are retrieving diamonds stolen from a noted gem dealer. As it turns out, their plane crashes on the very estate of the dealer. Thinking the duo are police officers, the dealer offers his home for their convalescence from the accident. Meanwhile, the diamonds have been snatched by a kleptomaniac dog and buried on the estate. When the smugglers track down the pair, they try to convince the dealer that they are officials from an institution from which the two have escaped. Before long, the carnival fellows, the crooks, the gem dealer and his family, along with a platoon of cops, are tearing up the grounds to find where the dog has buried the diamonds.