“A page-turner of a fantasy with elements of humor as well as intrigue, swordplay, and librarian-versus-hostile-book combat.” —Booklist From Sarah Prineas, author of the acclaimed Magic Thief series, comes a stunning new tween fantasy where books literally come to life! The powerful Lost Books at the palace library are infecting the rest with an evil magic, and two unlikely friends must figure out who, or what, is controlling the books and their power. If they can’t, the entire kingdom could be at risk. Sarah Prineas returns to her classic middle grade roots with this imaginative, fast-paced adventure for book lovers everywhere.