Jimmy arrives in Go Go Town via stagecoach, presenting himself as a young boy with sleepy eyes and deliberately slow movements. He travels with Annie, returning home after her education in the East. Unbeknownst to others, Jimmy is the newly appointed sheriff, tasked with imposing law and order on the lawless town. His arrival follows the murder of Annie's father by the Big Bad Boss, who rules through intimidation and violence.

Jimmy forms an alliance with Annie and Pero (sometimes called Ringo), leveraging his official authority, Pero's resourcefulness, and Annie's determination to protect her and challenge the town's criminal control. He carefully times revealing his sheriff status until the climax, observing the town's dynamics and avoiding early targeting by the Boss's enforcers.

His confrontation with the antagonists culminates in exposing the Boss's counterfeiting operation and defeating the criminal gang through direct armed conflict, reflecting Western genre conventions. While Jimmy experiences friction with Pero, whose actions occasionally frustrate or undermine him, their collaboration proves essential in achieving justice for Annie's father and freeing Go Go Town from the Boss's control.