Unwittingly, Nathan unlocks a spell and becomes the master of a man enslaved by shadow.

While sorting through an old estate in the basement of an auction house, Nathan finds a gold bracelet with strange markings on it. He recognizes it as an ancient language and reads the inscription out loud. This makes him the master of a man, Lucien, cursed into shadow by the Thule society during WWII. As this whole new world of the paranormal is revealed to Nathan, he finds both love and a fierce loyalty from Lucien, the man now bound to him—a loyalty he is going to need as the men who made Lucien into what he is wants him back. And they are willing to kill anyone who stands in their way.