When the Comanche Kid kills a childhood friend, Marshal Donovan convince their captain to send them out to capture the outlaw. Donovan believes that the Kid is operating in a small town called Sonora because it's the only place in Central Texas that he has committed a robbery or murder, so he and Rusty go undercover as saddle tramps to try to smoke the outlaw into the open.
An Indian raid on an army wagon inflames tensions that may erupt into an Indian war. Steve and Rusty investigate and discover that it was actually white men disguised as Indians who committed the raid. They set out to find out who was behind it.