At 14, Septimus is still battling the remnants of the Darke Domaine, which will remain until the power of the evil Two-Faced Ring is destroyed forever. The ancient Alchemie Fyre must be relit -—- a task that sends Septimus to the very origins of Magyk and Physik, testing both his skills and his loyalties to ExtraOrdinary Wizard Marcia Overstrand and Alchemist Marcellus Pye.

In the sixth book of the Magykal series, Alther Mella has been Banished, a Darke Domaine engulfs the Castle, and a Darke dragon is on the loose. Septimus Heap must use all of his skills to save the Castle and the Wizard Tower from destruction: He must enter the Darke.