Just finished reading "The Looming Tower, Al Qaeda and the Road to 9/11" by Lawrence Wright....It came out in 2006, so I'm behind the times...
He covers areas that most Americans are so unfamiliar with, the intellectuals who created the foundation for radical Islam, the tragedy and gradual downfall of Western culture, the major personalities surrounding the event, the failings of the American intelligence agencies....Easy to read, almost like a gripping novel...Has some flaws, but all in all a great read on one major 21st century tragedy...
Highly recommend....