Government agent Roy Rogers is sent to investigate a rash of cattle thefts by a cattle rustling gang. Roy catches rustlers who have been stealing government beef and terrorizing his town. What Roy doesn't know is that the gang's mastermind is beautiful East Coast socialite Marian (Carver), who uses her charm to get the times and locations of cattle drives from the ranchers she has seduced. Marian tries to use all her feminine wiles against Roy, who is immune to her advances, and works to squash the cattle rustlers.