A secret mermaid world is only the beginning... 10-year-old Kai feels like he's got this junior protector thing down. But when he fails to stop his mom and sister from being kidnapped, Kai isn't sure he's cut out for the job. Delphi is finally starting to feel at home in Pineapple Cove. But when she discovers an underwater world that just feels right, she questions where she truly belongs. Together, Kai and Delphi must face their fears, journey to an underwater world, and rescue Kai's family, before time runs out. A Mermaid's Promise is the magical second book in the Legend of Pineapple Cove series for young readers. If you like bravely exploring mythical worlds with trusty animal sidekicks, then you'll love Marina Bowman's fantasy-adventure story.