Sometimes you have to get lost. The Girl: Clio, seventeen, wants to spend the summer smooching her art-store crush, not stuck on a boat in the Mediterranean. At least she'll get a killer tan. The Mission: Survive her father's annoying antics. Oh, also find some underwater treasure that could be the missing link to a long-lost civilization. The Crew: Dad's absentminded best friend Martin, his scary girlfriend Julia, her voluptuous daughter Elsa . . . and then there's Aidan, Julia's incredibly attractive, incredibly arrogant research assistant. What's going on behind Aidan's intellectual, intensely green eyes, anyway? As Clio sails into uncharted territory she unveils secrets that have the power to change history. But her most surprising discovery is that there's something deeper and more mysterious than the sea—her own heart.