When Charmain is asked to housesit for Great Uncle William, the Royal Wizard of Norland, she is ecstatic to get away from her parents, but finds that his house is much more than it seems.

Two powerful young enchanters, Cat, the future Chrestomanci, and Marianne, who is being trained to be Gammer of the Pinhoes, work together as friends to try to end an illegal witches' war and, in the process, right some old wrongs.

Although an orphan, Earwig has always enjoyed living at St. Morwald's, where she manages to make everyone do her bidding, but when she is taken in by a foster parents who are actually a witch and a demon, she has a hard time trying to turn the situation to her advantage.