1945. They have survived the Blitz, but when Simon, Patricia, Evelyn, and Larry step through a magical library door, they walk into an enchanted kingdom of fresh adventure and danger. A bewitching wonderland of fairies, bears and tree gods, which is now under threat from the mysterious silver robots of the Unreads. The many stories of the Library are locked in eternal war, and the children's only hope is to find the mysterious Librarian. What they discover will change not just their own lives, but the fate of the world, for ever.