After two decades of marriage, Annie Colwater's life crumbles when her only child leaves for school and her husband confesses his love for another. Lost and alone, Annie seeks refuge in her childhood town of Mystic, where she reconnects with her past and first love, Nick Delacroix, who is grappling with his own tragedy as a recent widower with a silent, grieving daughter. As Annie and Nick heal their wounds together, they cultivate a tender love and a sense of family. But as life tests Annie with new challenges, she stands at a crossroads, facing heartbreaking decisions about love and sacrifice.