Attempting to win the favor of the Hotel Nantucket’s new London billionaire owner, general manager Lizbet Keaton, with drama behind closed doors, staff and guests with complicated pasts, a ghost roaming the halls and her own romantic uncertainty, has her work cut out for her.

When the will of a recently deceased ladies' man mandates a summer-long reunion for his daughters from different marriages at his posh Nantucket house, the three sisters are forced to confront long-festering resentments and misunderstandings as well as challenges in their private and professional lives, a situation that is complicated by a shocking revelation and the arrival of their mothers.

Newly widowed, Eleanor Sunderland finds dreams of a family reunion in Nantucket shattered when her money-driven children suggest she sell the house and move to a retirement home, and finds a lone ally in her 22-year-old granddaughter, Ari, who moves in with her for the summer.