Teenager Stacy Vaughn wants the wild Appaloosa that's for sale where she takes riding lessons, but her mom says "No." Stacy wonders if she will have to accept her future stepfather's help to convince her mom that the Appaloosa can be tamed. But if she gets the wild gelding, can she train him enough to satisfy her mom before the end of summer? How can Stacy prove that the horse is no longer dangerous?