A magical tale of friendship, the joy of reading, and the power of the imagination!When Oliver finds a lost library book fluttering behind a secret door in his bedroom, he knows he must return it. But when he does, a mysterious world opens up beneath his feet, taking Oliver, his new friend Rosie, and the book in tow. What--or who--will they find waiting in this strange new place? And how will they escape? A beautiful, lyrical take on the imaginative power of books and the transformative power of friendship.