He's the last person you'd suspect. An agent in the FBI's Behavioral Analysis Unit, he's a genius at getting inside the minds of killers, meticulously piecing together their motives and methods. But he's also the man they call "Loverboy," the very psychopath they've been hunting. He operates in the shadows, a young, solitary man who has mastered the art of hiding in plain sight.
But his perfect world is shattered by one mistake. When the sister of his latest victim begins a relentless search for the truth, his two lives collide. Now, the hunter becomes the hunted, and the most dangerous killer of all finds himself in the crosshairs. With every step she takes, she gets closer to revealing his secret, threatening to expose the man who hunts monsters and is one. Can he stay ahead of the sister who seeks justice, or will his own pursuit of a killer be his ultimate undoing?