Rescue Princesses: The Enchanted Ruby, Paperback

Princess Scarlett has always longed for adventure. When two princesses come to stay at Bearbrook Castle, she takes her new friends to a secret island in the river to meet a special otter family. When a speeding boat injures a fluffy baby otter, the princesses must reunite him with his family. They'll need to learn some brilliant new ninja moves, and even solve a mystery!