France, 1714: Adeline LaRue, desperate to escape an unwanted marriage, makes a Faustian bargain with the darkness, gaining eternal life but being cursed to be forgotten by everyone she meets. For 300 years, Addie travels the world, witnessing history and experiencing freedom, yet utterly alone. Everything changes in a hidden New York City bookstore when she meets a young man who remembers her name. This unexpected connection challenges the terms of her deal, forcing her to confront the demon who granted her wish and discover how far she will go to leave her mark on the world.