Kate Hannigan is in charge of her late mother's estate, and she has a plan: divide everything evenly, including the old family house on the harbor. What she doesn't realize is that her mother changed the will. Now, a family secret hangs in the balance. Meanwhile, her sister, Amelia, a struggling off-Broadway actress, enlists her hapless construction boyfriend to help with a local project, but he's more interested in summer tourists. Second-youngest, Megan, is preoccupied with her divorce... but not too preoccupied to make a dating profile, much to her sisters' mortification. Baby of the family, Clara, is single and refuses to date. She puts her teaching job above all else. Until a crushing revelation calls into question everything she knew to be true... including her own past.