"This is the story of how you were loved," Penelope MacLaughlin whispers to her granddaughter.

Penelope MacLaughlin marries a miller and gradually discovers he is not as she imagined. Nonetheless she remains determined to make the best of life at the lonely mill up the Gunn Brook as she struggles to build a home around her husband's eccentricities. His increasing absence leaves Penelope to run the mill herself, providing her with a living but also destroying the people she loves most. Penelope struggles with loss and isolation and suffers the gradual erosion of her sense of self. A series of betrayals leaves her with nothing but the mill and her determination to save her grandchildren from their disturbed father. While she can prepare her grandsons for independence, her granddaughter is too young and so receives the greater gift: the story that made them all.