When Sam Osborne, owner of the Circle S Ranch, is killed by cattle rustler Bo Gillman, the outlaw is advised by crooked attorney Virgil Parker to report the "mysterious" killing to Osborne's daughter, Helen. Steve Logan, a stranger, is jailed for the crime. He escapes and learns of Parker's scheme to steal the Circle S. Steve presents his Cattleman's Protective Association credentials to the sheriff and receives assurances of aid. Steve's former sweetheart, Mary Curtis, confirms Parker's treachery. In a gun battle, Parker, Gillman and the rustlers are rounded up and the Circle S is saved for Helen. Steve and Mary take up their romance again.