Great book. The FBI was incredibly frustrating to read about. Not many people would have been persistent enough to stick with this. I'm impressed with how diligently the author worked to track this guy down.
One small gripe though - the author seemed way too self conscious about his political identity add a result of cooperating with the guys in suits. Was he trying to spin it as an internal struggle between who he was, and who this experience made him become? Not buying it, Cliff.