On the morning of the ceremony, the bride-to-be meets an elderly woman named Edith Herron. During their spontaneous yet profound conversation, Edith gives Clare the courage to do what she longs to do: follow her heart. Three weeks later, Clare learns that Edith has died, and that the elderly woman has given her another unexpected gift—the space to discover what she truly wants—an old house along the Delaware shore.

Though the rambling Blue Sky House has been empty for years, Clare instantly senses a deep connection to Edith inside its walls. With the help of her mother, Viviana; her surrogate mother, Cornelia Brown; and her former boyfriend and best friend, Dev Tremain, Clare begins to piece together the story of Blue Sky House—a decades-old mystery more complex and tangled than she could have imagined.