Cross by James Patterson
The Butcher is motivated by a never-ending hate for his father and greed. He is an assassin for hire so he gets paid to kill people he kills, which makes money on of his motives. Also every kill he completes is a way for him to kill his father again. In a way each kill is his way at getting back at his father for what he did to him as a child even though he already killed him. Which proves that no matter how many people he kills he will never be happy. What his father did to him will never be undone. The Butcher will do whatever it takes to get the kill even if it means loosing his life in the end.