The astonishing true story of THE HUNT FOR THE ANTHRAX KILLER, the man who held America hostage by preying on our worst fears. Updated with New Material Features photos and transcripts of the original anthrax letters National bestselling true-crime author Robert Graysmith lends his investigative insight to the definitive case study of America's invisible terrorist. Based in part on information from the FBI's Amerithrax task force, as well as the author's independent research, and with official photos and transcripts of the anthrax letters, this is the most comprehensive work to date about the plague of terror that arose in the wake of 9/11/01--and the relentless scientific manhunt to stop it.