A stranger walks into Clare Cross's diner carrying nothing but a photograph of himself and no memory of who he is. Determined to help the stranger uncover the truth, Clare soon finds herself entangled in the murder of the man's uncle and a deadly mystery surrounding the Kareth, an ancient sacred book whose secrets have been fiercely guarded for centuries. As rival factions race to claim the Kareth, Clare is drawn deeper into a world of deception, kidnapping, and murder. With danger closing in and allies becoming suspects, she must decide whom she can trust and how far she is willing to go to protect the secret others are willing to kill for. In a battle between darkness and light, the fate of the Kareth may rest in Clare's hands if she can survive long enough to uncover the truth.