Fourth in the Merryfield Hall Riding School series Amber and her friends are excited to hear that a middle-eastern princess will be visiting Merryfield Hall this summer. Unfortunately Princess Rana says she doesn't ride and helps out with stable duties instead. But Amber soon discovers that Rana is riding her own pony, Emerald, in secret, and is scared to tell her pushy parents for fear of failure. Amber persuades Rana to compete in the summer show. Will the princess succeed and prove to her parents that she can ride?