Leo Black is a professor at Oxford University, lecturing on the ethics of war and peace. His students love the depth of his lectures and the faculty have a wary respect for his intellect. All that remains for him to truly be accepted into the fold is becoming a fellow. The only thing stopping Leo is himself. His calling. His art. His siren song is playing, and like a man-possessed he finds himself fading back into a shadowy world he thought he'd left behind. Because there is one thing Leo Black knows better than anyone else: the art of killing.