Cast & Crew
Black Knight, a prize-winning thoroughbred owned by Peg Garth and her niece Joyce, is being shipped West for an important race when it is kidnapped by bookie Rod Stevens, who doesn't want Black Knight to win. While Stony Brooke, Tucson Smith and Lullaby Joslin, cowboys known as "The Three Mesquiteers," are watching a newsreel about the kidnapping, they notice a strong resemblance between Black Knight and Mesquite, a wild horse they have just captured. Later, as they ride with Mesquite, a reconnaisance pilot spots them and reports that he has found Black Knight, resulting in the Mesquiteers arrest by Sheriff Brown. When Joyce and her groom, Snowflake, come for the horse, they, too, believe it to be Black Knight, but her aunt realizes the mistake and apologizes to the Mesquiteers, who had just managed to escape from jail through one of Lullaby's magic tricks. As Peg explains that all of Black Knight's winnings go to help a children's hospital, the Mesquiteers decide to help her. Soon, when they see a picture of Rod, who is known to be the kidnapper, in the newspaper and they recognize him as a man they had seen while stopping to water their horses. They try to go after Rod, but his men warn him in time to avert his arrest. With nothing else to do, Stony suggests entering Mesquite in the race, posing as Black Knight. Although Joyce is reluctant because of the improprieties, her fiancée, Don Weston, convinces her to go along with the plan, but not inform her ailing aunt. Mesquite wins the race and Rod is furious until Weston, with whom he had been working all along, tells him that racing stewards will take the prize money away if they learn the truth, so Peg will undoubtedly pay the ransom to get her horse back before an official examination results in a family scandal. When the new demands are made, the Mesquiteers tell Joyce to deliver the money as instructed, then chase after the kidnappers when they get the money. After a chase through the desert, the Mesquiteers capture the gang and Don is revealed as the mastermind behind the plot. Finally, Black Knight is returned in time to be examined by racing officials, and Peg's prize money is saved as well as her reputation. As they part, the two women and the Mesquiteers promise to see each other next summer.
Johnny Lang Fitzgerald
A news item in Hollywood Reporter at the start of the film's production mistakenly called it Rogers of the Black Hills. Variety reviewed the film under the title Riders of Black Hills. According to modern sources, Bud Osborne, Art Dillard, Milburn Morante and Jack O'Shea were also in the cast. For additional information on the series, consult the Series Index and see the entry below for The Three Mesquiteers.