When Natalie Campbell sets out on a class trip to Greece, she knows that checking off a summer bucket list with her best friend, Liam, is the perfect way to deal (or rather, not deal) with her new OCD diagnosis she's doing a beautiful job of ignoring. But when she grows closer with their Greek instructor's daughter, Melanie, Natalie's summer plans may be ruined in the best way possible. Natalie soon finds herself sneaking on boat rides to hidden beaches, taking secret midnight hikes to ancient ruins, and jetting off to nearby islands with Melanie as her guide. Falling for Melanie should be smooth sailing. Only Natalie can't help but think--and overthink--that love is equally thrilling and terrifying at the same time. Can she learn that sometimes the biggest adventures come with following your heart?