Galloping head to head... Melanie Graham is thrilled. She loves exercise riding, and she's good at it, too! Her aunt Ashleigh says Melanie would make a great jockey - she's really thriving at Whitebrook. But Melanie's not alone. Her friend Kevin McLean also wants to exercise-ride, and soon Melanie an Kevin are galloping together on the Whitebrook track. Racing for fun turns serious as Melanie becomes more and more competitive, testing their friendship to the limit. Kevin thinks Melanie is pushing herself too hard. Will she slow down before it's too late?