Riders Of The Black Hills finds the intrepid Three Mesquiteers accused of kidnapping a thoroughbred race horse. It's just dumb luck that they happened to catch a lookalike range horse who also has the same kind of speed the thoroughbred does.Some skulduggery on their part after they've cleared themselves of the kidnapping charge helps them raise the money for the horse's ransom. It's not something normally countenanced in cowboy heroes, but given the circumstances.The best thing about this the performance of stuttering Roscoe Ates who is normally a hero's sidekick as a sheriff. What law enforcement has come to. His scenes with Max Terhune while the Mesquiteers are prisoners are pretty funny.Terhune, Robert Livingston, and Ray Corrigan are the Three Mesquiteers in this film. Elmer is strangely absent, I almost don't know Terhune without him.