Marital comedy with a dash of murder.

When Len Stoddard wins Ted Ames ranch in a poker game he sends his brother Jake along with Ted to take over the ranch. When Jake is found murdered he offers a reward for the capture of Ted who now is believed to be a member of the Black Aces gang. Ted finds the probable location of the gang's hideout and sets out to clear himself.

A young doctor is determined to expose the killer when a surgeon is found stabbed to death in a hospital elevator.

Dan Adams resigns his position as prosecutor on the district attorney's staff and sets out to clean up a gang of fake-accident racketeers. He gets a job with an insurance company, and assures the company president he will get the goods on the gang or die in the attempt. At the company offices, he meets Carol Carter and she, believing he is a shyster (possibly redundant) lawyer in the employ of the racketeers gives him as little help as possible. Dan visits his brother Eddie, who is mixed up with the gang and tries to make him break away. Eddie is belligerent but finally, because of the pressure brought by Dan and his wife Tonia, agrees to go straight. The gang, led by "Duke" Trotti, fears he will squeal and they kill him, plus they make his death look like an accident and plan to collect on it. Dan is closing in on the gang when Carol, who is now his assistant, comes up with some conclusive evidence, but "Duke" has plans to get rid of her before she can give the information to Dan.

In Rio de Janiero to arrest a nightclub singer on suspicion of a murder in Hawaii, Charlie Chan becomes involved with the Rio police in solving the singer's own murder.

Although Charlie and Lee are in Monaco for an art exhibit, they become caught up in a feud between rival financiers which involves the Chan's in a web of blackmail and murder.

In their third and last teaming, Bill Crane and Doc Williams visit a country estate to investigate threatening letters from the mysterious 'Eye.'