 Cattle rancher Will Archer is killed by Mort, the leader of a rustling gang. Bob Archer is trailing the rustlers but is ambushed and struck down from behind by Mort. Later, Bob aids a man who is fleeing from pursuers. Bob dives the horsemen off, not realizing they are law officers. Mort escapes and Bob is arrested on the charge of aiding a criminal. Bob is enraged when he discovers from the sheriff that it was Mort whom he helped. Bob escapes and with his friend, Cookie, begins the task of bringing Mort and his gang to justice.