Book of Reality finds Score, Helaine, Pixel, and Jenna journeying back to Calomir, Pixel's home planet of virtual reality. Pixel hasn't been back to Calomir since being snatched from the futuristic planet when he was first pulled into the magic and danger of the Diadem. Pixel wants to see his parents again-and bring Jenna home to meet them. But instead of a happy homecoming, the four young magic-users find treachery, slavery, and deceit on Calomir, including a dark secret from Pixel's past. Can they find Pixel's parents, liberate the enslaved Drones, and win the battle against the evil force that not only controls Calomir, but also intends to conquer the entire Diadem?