Sam, a seven-year-old boy, is devastated when his mother leaves him for two weeks on his grandfather's ranch. Grandpa has a lot of rules, and Sam isn't happy about having to stay with him. But Sam's time on the ranch isn't all bad. He learns to ride a horse and also discovers some surprising things about his father, who died when Sam was a baby. When Sam is forced to overcome his fear of riding in order to help rescue Grandpa, Sam grows to appreciate both his grandpa and life on the ranch.