When the first boarders arrive, Rosie realizes working at the family stable will be more difficult than she anticipated. The extra horses aren't the problem however; it's one of the boarders that Rosie can't get along with. When Grandma explains 1 Samuel 16:7 to the girls, Rosie struggles to see how the verse applies. It takes an annoying boarder, a blind horse, and an extreme race to teach Rosie that while man looks at outward appearances, God looks at the heart.