When eleven-year-old Tilly Pages joins Oskar and his family on a Christmas trip to Paris, she and her friend bookwander into the land of fairy tales, where someone--or something--is causing chaos.

Eleven-year-old Tilly Pages, who has found comfort in her grandparents' bookshop since her mother's disappearance, now learns that she can bookwander into any stories, and decides to seek her mother.

"Tilly and Oskar embark on an impromptu trip to the Library of Congress in Washington, DC, in search of an elusive group of bookwanderers called the Archivists, who they believe are the key to restoring the balance and saving the British Underlibrary. Along the way, the friends realize that something strange is happening in the world of bookwandering: books are disappearing, people are forgetting their favorite stories, and stories are trying to drag...