Colonel Lee a homesteader is the object of terrorists who want to drive him off the range so that his horses cannot be entered in the county races and he refuses an offer of Martin Brierson to buy him out Pete Briersons brother in hiding because of his criminal record burns the colonels barn and injures his horses Convinced of Briersons responsibility for the terror tactics Lucky Larkin plans to ride Tarzan the colonels pet colt Brierson does his best to disqualify the horse but Larkin tricks him and wins the race Larkin captures Pete and forces him to confess The Brierson brothers are brought to justice and Larkin wins Emmy Lou a homesteaders daughter