Book excerpt: A two part book on domestic terrorism Part one is an inside look at FBI operations in its most complex investigation, that of Ted Kaczynski the Unabomber. After sixteen years of traditional forensic investigation resulting in disappointing dead-ends the FBI brought in the authors from counterintelligence and they quickly moved from traditional methods to implementing psychological techniques which resulted in the capture of Kaczynski in just twenty four months. Interesting insights on the FBI's use of the print media to help in its investigation and also contending with the broadcast media's threat to undermine the investigation in its final moments.Part Two deals with the lessons learned in the investigation and how they apply to international terrorism. Includes a recently declassified and not-previously published psychological study of the top ten domestic terrorists.