Haunted by the girl he couldn't save in his youth, and the murder he committed to avenge her, Detective Track Presius has a unique gift: the vision and sense of smell of a predator. When a series of apparently unrelated murders reel him into the depths of genetic research, Track feels more than a call to duty. Children are dying -- children who, like himself, could have been healthy, and yet something, at some point, went terribly wrong. For Track, saving the innocent becomes a quest for redemption. The only way he can come to terms with his dark past is to understand his true nature.