Bonnie and Sam are best friends. No one loves horses the way they do. When Bonnie whispers to them, they understand, and Sam always knows if they need a drink, or a hug, or a race around the paddock. Now it's time for the Royal Show, and the girls are going to help their riding teacher get ready for a big competition. But in a backyard near the showgrounds they see a sad, starving pony - and it's Bonnie and Sam to the rescue!