A senior officer once told me: The merciful cannot command troops, and the kind cannot be police. Good people can't be cops, because in the eyes of those who break the law, kindness is nothing but laughable weakness.

　　Unfortunately, I am neither kind nor weak. Those bizarre crimes and all sorts of criminals have become a part of my life. I have no choice but to think like them, to act like them, because every moment I am racking my brains, thinking about how to catch them.

　　My name is Eric Foster, I am a detective, and this is my story—a story of confusion, doubt, impulse, and intensity...