Harry returns as the winter knight. As a knight of the winter court in service to the fairy queen, Mab, Harry gets his first assignment from Mab, but as always when dealing with the fairy court – nothing is exactly as it seems. Multiple powerful forces are manipulating events and manipulating Harry along with them. Someone is also trying to blow up the island of Demonreach and Harry discovers the island’s true purpose. Of course, all the major events have a deadline for Harry to figure out what’s happening, midnight on his birthday, Halloween.