Physician Bess Codman has returned to her family's Nantucket compound, Cliff House, for the first time in four years. Her great-grandparents built Cliff House almost a century before, but due to erosion, the once-grand home will soon fall into the sea. Though she's purposefully avoided the island, Bess must now pack up the house and deal with her mother, a notorious town rabble-rouser, who refuses to leave.