Horses are Molly Moore's one true love. But the best her father can afford at an auction is an old, worn-out mare, which Molly will have to share with him. The horse certainly won't be enough to stop Freddy Westover's teasing. After all, he owns show horses. To Molly, though, Lady Sue is better than nothing - that is, until the mare produces a surprise that's better than anything: a baby mule! Now Molly can care for the most beautiful creature she has ever seen, Brown Sunshine of Sawdust Valley.