After a painful betrayal, Maddy Monroe's love life is in disarray, while her restaurant career is falling apart. When her grandmother goes missing, she meets up with her estranged sisters at the family beach house in Sea Haven, North Carolina. Reuniting with Nora and free-spirited Emma at the place where their family broke apart is a real struggle. Feelings of jealousy and resentment threaten to pull the sisters under. During the storm, tempers rage between Maddy and Gram's neighbor, Connor Murphy.
While the sisters pack up the family belongings, memories of past summers resurface. Long-buried secrets come to light as Maddy learns that all was not as it appeared that last summer in Sea Haven, nor today in the seemingly perfect lives of her sisters.
As family tensions rise and Connor stirs up trouble in Maddy's heart, the sisters must find a way to accept each other for the women they've become before the bitterness of the past ruins their hope for a future.