Jo Barkley already has a reputation as a good horsewoman, but can she prove to Dad that she can handle Stormy and Stub, the team of workhorse colts she wants to drive in the Draft Horse Pull at the Rockville County Fair? While she awaits her chance to drive Stormy and Stub, a neighbor asks her to train his two-year-old colt Scamp. Her pay will be getting to ride the colt the rest of the summer.

Percy, a know-it-all young cowboy from Montana, interrupts Jo's first training session with Scamp. He whacks the colt on the rump and rides off laughing. Jo tries to control her anger and convince...