Ashleigh's determined to make her dreams come true... In her second year of racing, Wonder, the Thoroughbred filly Ashleigh Griffen has helped raise, is the star of Townsend Acres Stables -- until the worst happens. Just as Wonder is about to start training for the important Breeder's Cup race, Ally, Wonder's regular jockey, is injured and can't ride. Wonder doesn't like any other jockey, and she won't perform. Only one person can ride Wonder now, and that's Ashleigh. She's never ridden in a race, but she's Townsend Acres' only hope. Can Ashleigh's dreams and Wonder's trust carry these two unlikely contestants into the winner's circle? Read Thoroughbred and experience the love and friendship between a determined girl and a very special filly.