Jack Randall plays Dunham, a wandering cavalier who comes to the aid of frontier heiress Mary. The girl's legacy is half-ownership of a prosperous saloon, the other half controlled by hissable villain Slater. With the help of no less than two comic sidekicks, Dunham cuts the villain down to size.

"MAN-TRAPPER! Jack rides into the land of the lawless...to measure a killer for his coffin!"