The Pony Express Rider is one of the great figures in the history of the West. Before the advent of the railroads his duty was to carry the mails through the wilderness harassed on every side by Indians and Highwaymen. In this production the hero is entrusted with a packet of money to carry to a distant point. The hand of the ranchman's daughter is to be his reward for safe delivery. A band of Mexican vaqueros waylays him and the packet is stolen. The hero is saved by his faithful horse and rides back to give the alarm. The cowboys are aroused and a posse starts in pursuit. After a thrilling chase the villain is captured and money recovered and the hero triumphs.