When his master is attacked and left speechless, Ranger is held responsible. On the lam from the Law, the canine hero links up with telegrapher Bill Brady and Bill's girlfriend Helen Meadows. He gets a chance to clear his name by helping Bill trap a pair of outlaws who plan to blow up a mail train and abscond with the loot.

Silent western

Lightning Bill Lewis sets out to capture Gómez, the leader of a ruthless gang that has been tormenting a border town. He prevents Gómez from kidnapping his girl, Mary, but Gómez escapes. With the aid of Captain Duerta, Lightning Bill pursues the gang, and when it is captured by Mexican soldiers he is free to marry.