Sensible thirty-six-year-old Sophie Anderson has always known what to do. She knows her role in life: supportive wife of a successful architect and calm, capable mother of two. But on a warm summer night, as the house grows quiet around her and her children fall asleep, she wonders what’s missing from her life. When her husband echoes that lonely question, announcing that he’s leaving her for another woman, Sophie realizes she has no idea what’s next. Impulsively renting a guest cottage on Nantucket from her friend Susie Swenson, Sophie rounds up her kids, Jonah and Lacey, and leaves Boston for a quiet family vacation, minus one.

Also minus one is Trevor Black, a software entrepreneur who has recently lost his wife. Trevor is the last person to imagine himself, age thirty and on his own, raising a little boy like Leo—smart and sweet, but grappling constantly with his mother’s death, growing more and more closed off. Hoping a quiet summer on the Nantucket coast will help him reconnect with Leo, Trevor rents a guest house on the beautiful island from his friend Ivan Swenson.