Twelve-year-old Christina Reese is the luckiest girl in the world.She lives at the Whitebrook Farm with her dad, Mike, and her mother, Ashleigh Griffen, one of the most famous jockeys ever. And when Christina asked for a horse for her birthday she got Wonder's Legacy, the last foal of her mom's famous racehorse, Wonder.But Christina doesn't feel so lucky. Everyone expects her to become a jockey, but Christina wants to be an Event rider. All she needs is the perfect horse. Then she sees Sterling Dream, a beautiful gray mare who's being forced to race against her will. Will Christina risk everything she has to take a chance on a Dream?