The Lone Ranger is hot on the heels of the Kansas kid when he encounters another man "Slim Roberts" also a lawman but posing as an outlaw. They create a plan that if successful could see them accepted into the 'Kids' gang.
The Ranger and Tonto head for Granite City to try and curtail the activities of the "Death Gang who have been menacing the town. On the way they discover a secret about the towns jail, which if used correctly could save lives.
When an outlaw family badly wounds a man in a robbery, the estranged son is accused while the outlaws' father is also wounded in the robbery which inspires The Lone Ranger to disguise himself as a doctor to get access to the gang.