U Don't Know Jack : 9781440158537 : 10 Aug 2009 : U think you know pain. But you don't know. U think you know terror. But you don't know. U think you know serial killers. But: "U Don't Know Jack." For the first time he thought about the FBI. He knew they were looking for him. It didn't matter. When he decided to kill, he developed a plan to make himself virtually invisible from the eyes of Big Brother. Rachel traced what she thought was a figure down the slit to the floor. The tip of a boot was protruding from underneath the wool curtain. The tip of a boot that wasn't hers. The Ripper could see the fear on her face. It was so apparent. The hair literally stood up on the back of her neck. Fear stood between Rachel and the curtains. Nothing stood between her and the Ripper. She started to back away.