He thinks he sees a flash of emotion in her eyes. Sympathy? Then it's gone. 'Whatever you think this is going to be like,' she whispers, 'it's going to be worse.' When beautiful serial killer Gretchen Lowell captured her last victim, the man in charge of hunting her down, she quickly established who was really in control of the investigation. So why, after ten days of horrifying physical and mental torture, did she release Detective Archie Sheridan from the brink of death and hand herself in?