Gwen Castle's Biggest Mistake Ever, Cassidy Somers, is slumming it as a yard boy on her idyllic island this summer.

He's a rich kid from across the bay, and she's from a long line of fishermen and housecleaners who keep the island's summer people happy.

Gwen worries a life of cleaning houses will be her fate, too, but just when it looks like she'll never escape her past - or the island - Gwen's dad makes a surprising recommendation.

Sparks fly and secret histories unravel as Gwen spends a gorgeous, restless summer struggling to come to terms with what she thought was true-about the place she lives, the people she loves, and even herself.