Ever since her life took an unexpected turn, Nan Powell has enjoyed living alone on the sun-drenched shores of Nantucket. At sixty-five, she's just as likely to be found at Windermere, her beach front home, as she is skinny dipping in her neighbor's pool. But when the money she thought would last forever starts to dwindle, Nan decides to do something drastic to keep hold of her free-spirited life: open up Windermere to strangers.

After placing an ad for summer rentals touting water views, direct access to the beach, and a sexagenarian roommate, Nan's once quiet house is soon full of noise, laughter, and the occasional bout of tears. Between her eclectic new tenants and the sudden return of her son, Nan gets a taste of what life is like when you have someone to care for besides yourself. But just as she starts to happily settle in to her new existence, the arrival of a visitor from her past threatens to turn everyone's lives upside down...