Sun, surf and tropical breezes are no ‘day at the beach’ because being a teenage mermaid never takes a vacation. With all the mers in Jade’s life now safe, happy and legit (with passports to prove it) and the underwater mer-world off the coast of Port Toulouse on the road to democracy, it’s time to relax and plan for the future. Jade can’t think of a better way to celebrate than with a tropical wedding in the Bahamas with Mom and Dad to finally make their family ‘official’. Soon, Jade is enjoying the tropical sunshine, all-you-can-eat buffet, and island day trips. But when Jade gets lost in the island’s famous waterfront Straw Market, something doesn’t feel quite right. A body splashes into the water as a cruise ship enters the harbor and a teen boy selling conches from his boat behind the market knows more than he’s willing to admit. With no body, no leads, and no other witnesses, though, the local police don’t seem too concerned. Maybe Jade’s imagination has been acting up on her, just like Cori said, considering everything she’s been through in the past few months. But with Mom and Dad off on a honeymoon excursion it wouldn’t hurt to check things out, would it? Little do Jade and Cori realize, they are about to uncover more secrets about the splashing body, dangerous cruise ship cargo, and more questions than answers lurking in the nearby Caribbean waters.