 When Sam Osborne (Wilfred Lucas), owner of the Circle S Ranch, is killed by cattle rustler Bo Gillman (Dick Curtis), the outlaw is advised by crooked attorney Virgil Parker (Walter Soderling) to report the "mysterious" killing to Osborne s daughter, Helen (Nell O Day) . Steve Logan (Johnny Mack Brown), 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 (Edward Cassidy) and receives assurances of aid. Steve s former sweetheart, Mary Curtis (Lynn Merrick as Marilyn Merrick), 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.