Description: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.