Mage Alex Verus has gone from a Camden shopkeeper to one of the most powerful mages in Britain. Now his last and most dangerous battle lies before him. His lover, the life mage Anne, has fallen fully under the control of the deadly creature she made a bargain with, and it is preparing to create an army of mages subject to its every whim.

Alex, the Council, and the Dark mage Richard Drakh agree to call a truce in their war, and plans are made for a joint attack. But Alex knows that it's only a matter of time before Drakh and the Council turn on each other . . . and neither cares about keeping Anne alive. Can Alex figure out a way to stop Anne and to free her from possession before time runs out?