In this sixth installment of the wildly popular Septimus Heap series, international best-selling author Angie Sage continues to follow Septimus as he struggles to protect his Magykal world. With Alther Mella banished, a Darke Domaine engulfing the Castle, and a Darke dragon on the loose, Septimus will have to use every ounce of his abilities to save the Castle and the Wizard Tower. He must also go into the Darke—but fortunately, he won't have to go alone.