 Bill Tracy (Buffalo Bill, Jr. ), a Cattleman s Protective Association agent, working undercover, on his way to Sonora, a town dominated by rustlers, saves Betty Carter (Betty Joy) from a situation, but her rancher father (Horace B. Carpenter) ---believing Blackie s suggestion that Bill is a rustler---forbids her to see him. Bill and his pal, Heinie Schmaltz (Gene Schuler), rescue each other from various plots and ambushes by the rustler, and eventually discover that Blackie (Lew Meehan), Carter s foreman, is the leader of the rustlers.