The Magic Library is finally reopening its long-locked doors. But it needs four librarians. To become one, four magic books need to be found. Surprisingly, four homeless people find them. One is called Peter Butterpig, a bright pink pig with great big butterfly wings. Two others are old robots called Sir Copperpot and Uncle Glitch, who are falling apart with failing memory banks, yet they never forgot to take care of the fourth. She was a nine-year-old girl called Little Meredith Pocket, who was orphaned very young when her parents mysteriously disappeared. Yet she and her three friends are in for the greatest time of their lives once they being working as the Magic Library's new librarians.