Seventeen-year-old Whit Allgood and his 15-year-old sister, Wisteria (Wisty), think they are normal teenagers until the recently empowered political party sends soldiers to arrest them. The New Order, ruled by an evil dictator known as The One Who Is The One, accuses them of witchcraft and wizardry. As the kids are being pulled from their home, Whit and Wisty’s parents give them a drumstick and a blank book. They’re thoroughly confused, and they certainly don’t understand what’s happening when flames begin to shoot out of Wisty’s body.
The kids are taken to a prison full of other young people. As they await trial, Whit sees his missing girlfriend, Celia, in a dream. The trial is a farce, as the kids are given no legal representation and quickly deemed to be a witch and a wizard by The One Who Judges. They’re sentenced to hanging, but this can’t take place until they are 18. For Whit, it won’t be long. They’re sent to a former mental hospital to await hanging. Whit has another dream of Celia. She tells him there is a prophecy written on a wall in his future; he needs to learn about it because he and Wisty are part of it. Whit and Wisty begin to see that they do have powers about which they never knew.
At the mental hospital, the kids are threatened and tortured by two ghastly members of the New Order called the Matron and the Visitor. Although their prison is supposed to be magic-proof, the kids discover they can still use their powers. Celia helps Whit and Wisty escape, first guiding them through the dimension where she exists, called the Shadowland. When they reach their world again, outside the walls of the asylum, they see the extensive damage done by the New Order. Sasha, a friend of Celia’s, leads Whit and Wisty to the bombed-out remains of a pricey department store called Garfunkel’s. The store is now inhabited by several hundred young people who have formed their own system of government. They enlist Whit and Wisty to help them break other children out of prison. They lie and tell Whit and Wisty that Whit and Wisty’s parents are also in that prison, just to get them on board with the plan.
Whit and Wisty use their powers to help with the jailbreak. They learn they are mentioned in a prophecy as liberators or rescuers, and they find out their parents are still free. Whit and Wisty help many other imprisoned children escape, and Wisty uses her powers to burn up the prison in the process. Whit and Wisty return to their new home at Garfunkel’s, where they learn to increasingly trust in and rely on their powers. In a brief supernatural encounter with their parents, Wisty’s drumstick turns into a magic wand and Whit’s blank book becomes a magic book full of spells. Wisty ends the story by urging readers to seize the moments in their lives rather than worrying about what is coming next.