When beautiful serial killer Gretchen Lowell captured her last victim - the very detective who was trying to hunt her down - she quickly established who was really in control of the investigation. So why, after 10 days of horrifying physical and mental torture, did she release Detective Archie Sheridan and hand herself in? Paperback , 421 pages Published February 1st 2008 by Pan (first published January 1st 2007)