One hot, sticky summer in Bledsoe, Georgia, twelve-year-old Kay Whitaker stumbles across a stilt house in a neighboring marsh and upon Andy Webber, a boy about her age. He and his father have recently moved back to Georgia from California, and rumors of the suspicious drowning death of Andy’s mother years earlier have chased them there and back. Kay is fascinated and enamored with Andy, and she doesn’t listen when her father tells her to stay away from the Webbers.

In a historic farmhouse outside Boston, 70-year-old Percy Darling is settling happily into retirement: Reading novels, watching old movies, and swimming naked in his pond. His routines are disrupted, however, when he is persuaded to let a locally beloved preschool take over his barn. As Percy sees his rural refuge overrun by children, parents, and teachers, he must reexamine the solitary life he has made in the three decades since the sudden death of his wife. No longer can he remain aloof from his community.

Late one night, a teenage couple drives up to the big white clapboard home on the Blessing estate and leaves a box. In that instant, the lives of those who live and work there are changed forever. Skip Cuddy, the caretaker, finds a baby girl asleep in that box and decides he wants to keep the child . . . while Lydia Blessing, the matriarch of the estate, for her own reasons, agrees to help him.

1932. After the Great War took both her beloved brother and her fiancé, Violet Speedwell has become a "surplus woman," one of a generation doomed to a life of spinsterhood after the war killed so many young men. Yet Violet cannot reconcile herself to a life spent caring for her grieving, embittered mother. After countless meals of boiled eggs and dry toast, she saves enough to move out of her mother's place and into the town of Winchester, home to one of England's grandest cathedrals.

Annabel Cooper wants to save the world. Her story begins in 1964 with her journey to Freedom Summer in Mississippi, where the disappearance of her first love ignites a lifelong fight for justice. Years later, she, her husband, and four other couples form a Boston political collective where they live together with their children in a rambling Boston house. As the era's social upheaval intensifies, they move their children to Vermont, where they can remain safe from the world's threats; their parents continue their political work, taking turns traveling to Vermont to care for the children.