When Billy Blue Cannon is forced into a showdown with wanted gunfighters, he is saved by a wandering dentist who proves to be fast with a gun. John Cannon returns the favor to Doc Henry by agreeing to send Billy Blue to help the dentist establish a practice in Tucson. Billy Blue is kidnapped en route and held for ransom by the gunfighters, Jacques Dubois and Kid Curry. The boy loses faith in his new friend when the dentist throws in with the crooks. John Cannon corners Doc Henry with the ransom and prepares for a shoot-out.