Bestselling author Cecelia Ahern follows THE GIFT and P.S. I LOVE YOU with the mesmerizing story of a teenaged girl coming face-to-face with grief, growth, and magic in the Irish countryside, after a mysterious book begins to reveal her own memories from one day in the future. Perfect for long-time fans of Ahern, as well as for younger readers coming to her for the first time, THE BOOK OF TOMORROW'S strong voice and sophisticated storytelling mark an instant new classic from this already beloved author.