Captain Midnight: Deadly Diamonds (S1E03)

While Midnight plays with his newest invention, and omni-counter, old friend George Maynard arrives at headquarters. George has concerns about diamonds being smuggled over the Mexican border. Midnight flies down to New Mexico to investigate and accidentally picks up readings of diamonds in the desert. Midnight lands to investigate, and deducts that someone is using herds of wild horses to run diamonds back and forward between Mexico and the United States. While out investigating, someone tries to shoot Midnight but escapes. Later the shooter meets two other men and discusses the situation. Midnight follows a set of horse prints till they stop at tire tracks. There they find a discarded horseshoe with a diamond in it. Heading to the local town they see the sheriff. It is arranged to drive the wild herd through the town, and the trained horse will join them and betray its owner, assumed to be the leader of the smuggling ring. The plan works and the sheriff arrests the men.