Rio Grande Ranger

Bob, a Ranger, and his pal Hal, are ordered to lure Jim Sayres and his gang of outlaws across the border from Shonto into the United States. Bob disguises himself as a bandit named "Smoke," while Hal gets friendly with Sayres and tells him that there is a thousand dollar reward for the capture of Smoke. As Bob enters the Shonto area, he rescues Sandra Cullen and her little brother Buzzy from a mad steer and is invited to remain at the herding camp as a guest of the Cullens. When Bob goes to Sayres' casino, Sayres' first-in-command, Sneed, tries to disarm him, but Bob is too quick for him. Sayres is impressed by Bob's abilities and hires him after firing Sneed, and Bob's first assignment is to rustle the Cullen herd. Sneed warns Cullen of the raid, and Bob, who has gone along with the raid in order to maintain his cover, is confronted by defending cowhands. Bob easily escapes; however, when Cullen sees him talking with Hal, he tells Sayres of their ruse. Sandra, who has fallen in love with Bob, defends him from her father, but both Bob and Hal are later captured by Sayres' gang. Bob and Hal learn that the gang is plotting to kidnap Sandra and Buzzy as protection against a posse, and the two lawmen escape and lead the gang across the border as planned. The outlaws are captured and Sandra and Bob are reunited.