Driven to desperation by his young and extravagant wife, alienist Dr. Emil Brandt has arranged a perfect crime; now he begs the police to lock him up before he can commit it.

Wealthy Mr. Kennedy shoots his secretary, Channing, during a parlor game, but it turns out the gun was loaded with real bullets. Luckily, criminologist Phillip Montrose is on hand to help the police. When Kennedy quickly ends up dead as well, the police think it's a tidy murder-suicide, but the family lawyer knows of a letter that voiced Kennedy's suspicions about someone who was out to get him. Soon, the cops are on the trail of a ruthless and clever killer who is one step ahead of even Montrose.

Suave private detective Simon "The Saint" Templar arrives in San Francisco and meets Val, a woman whose police inspector father killed himself after being accused of corruption and dismissed from the force. Convinced of the man's innocence, Templar takes it upon himself to vindicate the memory of Val's father. To do so he must take on the city's most dangerous criminal gang, while also battling hostile members of the police department.

A businesslike syndicate runs all the gambling joints in town; least profitable is honest Mike Lee's. Under pressure to allow cheating, Mike "walks out," leaving tough-minded daughter Lady Lee to earn a living the only way she knows. She soon becomes a success gambling among the rich, but, falling out with the syndicate, she considers the marriage proposal of blueblood Garry Madison. Can such a match work despite snobbery and old associations?

Lee is a fresh young kid from the South when he gets a job with The Press. His first assignment on gangsters gets his name in the paper, the police on a raid and Lee in the hospital.

An ex-gang member tries to resist his old cohorts' criminal influence after he suddenly becomes a Hollywood movie star.

A vicious crime lord decides that he has had enough and much to the shock of his colleagues decides to give the business to his second in command and retire to Florida after marrying his moll. Unfortunately, he has no idea that she and the man are lovers.

Michael Lanyard, a reformed cracks-man, adopts Adrienne, the daughter of an old friend, and goes to Southampton to attend a party celebrating her engagement to Bobby Crenshaw, the son of a wealthy society couple. The Count and Countess Polinac, international jewel thieves, also attend the party, and Count Polinac forces Lanyard to open the safe containing the jewelry of the guests by threatening to expose Lanyard's criminal past. Lanyard forestalls the count, however, and protects the valuables. The count and countess are arrested, and Michael's secret is kept safe.

A lovely dame with dangerous lies employs the services of a private detective, who is quickly caught up in the mystery and intrigue of a statuette known as the Maltese Falcon.