Abbie Fox hasn't seen her father or two younger sisters in almost two years, during which she's jetted around the world and experienced life, if not love. Now Lily, the baby of the family, is sending urgent e-mails begging Abbie to return to Nantucket. Middle sister Emma has taken to bed after losing her job and her fiance , and the woman renting their guest house may have set her sights on their widowed father.

Over the course of the summer, the sisters' lives grow as turbulent as the unpredictable currents encircling Nantucket.