Harrison, Paula. Rescue princesses #13

Includes an excerpt from The secret promise

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!

Appeals to 2nd-3rd graders

Reading level grade 3