But trouble starts brewing the moment the two orphans are summoned to live in Chrestomanci Castle. Frustrated that the witches of the castle refuse to acknowledge her talents, Gwendolen conjures up a scheme that could throw whole worlds out of whack.

    Beginning at the Seahorse Cafe, social hub of the Old Reef, this novel takes the reader on a journey, from the doomed coral gardens of Reeftown, to a wreck and an underwater junkyard, across the expanse of the Withered Plain.