Harry Dresden, Chicago's only professional wizard, is about to have a very bad day. Because as Winter Knight to the Queen of Air and Darkness, Harry never knows what the scheming Mab might want him to do. Usually, it's something awful. He doesn't know the half of it. Mab has just traded Harry's skills to pay off one of her debts. And now he must help a group of supernatural villains--led by one of Harry's most dreaded and despised enemies, Nicodemus Archleone--to break into the highest-security vault in town, so that they can then access the highest-security vault in the Nevernever.