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.