Chinese sleuth Charlie Chan discovers a scheme for the theft of government radar plans while investigating several murders.

A horse called Brilliant is the only one who knows the location of a gold mine. When Brilliant's owner is killed, the trio known as the Three Mesquiteers (Bob Steele, Tom Tyler and Jimmie Dodd) are mistakenly arrested for the murder.

It is now an accepted fact that the best of Johnny Mack Brown's Universal westerns were directed by the talented Joseph H. Lewis. Boss of Hangtown Mesa may not be in the same league as the Brown-Lewis classic Arizona Cyclone, but it comes awfully close. This time around, hero Steve Collins (Brown) comes to the aid of Betty Wilkins (Helen Deverell), who has taken over the telegraph-line business established by her uncle John (Henry Hall). The latter was murdered by outlaws who don't cotton to having the territory linked up electronically with the rest of the world.

A pair of bus drivers accidentally steal their own bus. With the company issuing a warrant for their arrest, they tag along with a playboy on a boat trip that finds them on a tropical island, where a jewel thief has sinister plans for them.

After discovering his star dancer is expecting and can't perform, film producer H.W. Workman and his publicist concoct a scheme to stage a college dance contest to find a new star.