Bronco races to keep a vengeful deserter from ambushing Marshal Kilgore and the prisoner he's taking to jail.

Bronco helps a friend fight a rancher and his hired gunmen, a fight complicated by the friend's love for the rancher's daughter.

As part of a scheme to uncover an insurrectionist group famous actor Edwin Booth pretends to share his relative James Wilkes Booth's hatred of the Union. But when irate townspeople try to kill the traitor, Bronco must protect the seeming turncoat.