Silent screen cowboy Bob Custer stars as Ted Saunders, an insurance agent who is assigned to solve the robbery and murder of a stage coach line owner, with the owner's dog, Rannah, as his only witness. The investigation gets complicated when a deputy agent assigned to help Saunders turns out to be a phony in cahoots with the company responsible for the murder. It's up to Rannah to save Saunders and catch the villains. Rin Tin Tin Jr. co-stars.