Sun, surf, and tropical breezes-too bad this mermaid's perfect vacation is about to turn into a menacing mystery! Jade can't think of a better way to celebrate peace in the underwater mer-world than with a tropical vacation in the Bahamas with her family and BFF. With nothing to worry about, Jade enjoys the tropical sunshine, all-you-can-eat buffets, and island day trips. But when a body splashes into the water as a cruise ship enters the harbor, Jade and Cori realize that there might be trouble in paradise. And the mysterious boy selling conch shells on the beach definitely knows more than he's letting on. Time is running out to solve this tropical mer-mystery!