Overland Mail

Two investigators for a stagecoach company are assigned to find out why the company's stages keep being ambushed. They discover that the culprits are white men disguised as Indians, and they set out to discover who is behind the plot.

Overland mail riders Jack Mason and his pal, Porchy, learn that an Indian uprising is imminent because one of the tribe has been murdered by a gang of outlaws. The primary town of the mail route is also being used as a hideout and base of operations for a gang of counterfeiters led by Joe Polini. Jack and an undercover federal agent, Duke Evans, round up the counterfeiters and turn Polini over to the Indian Chief as the killer of the brave.

The Hartley--Goodrich stage line suffers a double blow when its founders, Frank Hartley and Marcus Goodrich, are killed during robbery attempts. Goodrich's daughter Judith and the company foreman, Gabby Hayes, are determined to keep the business going, despite debt caused by the string of attacks.

Taken on the S.P. Railroad, near tunnel No. 9. The train comes rushing out of the tunnel and passes at full speed...