Synopsis: This western has Tim McCoy playing federal agent, "Lightning" Bill Carson again. "Lightning" and his sidekick, Magpie set out to stop a gang of rustlers who are using high-powered trucks.
When Blackton (Forrest Taylor) outbids Bill Carson, Bill suspects he will have to rustle cattle to fulfill the contract. So, Bill arrives posing as a Mexican and when he rustles the cattle from the rustlers, it gets him into the gang.
Hoping to bring them all to justice, he gets in trouble when his true identity is revealed.