Over twenty-five years ago, Liam Tate and Acadia McCormick Knox fell in love. It was summer on Nantucket, and seventeen-year-old Liam knew that wealthy, college-bound Cadie was way out of league for a local boy who restored boats for a living. Yet the two became inseparable, seizing every chance to slip away in Liam's runabout to secluded spots, far from the world that was trying to keep them apart.

After Cadie returned home to New York and discovered she was pregnant, her parents crushed any hope of communicating with the boy she'd left behind. Unanswered letters and calls couldn't change Liam's heart, but over the years he's settled into a simple, solitary life in his rambling beachfront house. Now he's learned that Cadie is returning to Nantucket for the opening of her son's art show. Over a weekend of revelations and poignant memories, Cadie and Liam have an opportunity to confront the difference time can make, the truths that never alter, and the bittersweet second chances that arrive just in time to steer a heart back home…