The Looming Tower by Lawrence Wright

The Looming Tower: Al Qaeda and the Road to 9/11 is a historical look at the way in which Al-Qaeda came into being, the background for various terrorist attacks and how they were investigated, and the events that led to the 9/11-2001 terrorist attacks on the United States. The book was written by Lawrence Wright, and he received a Pulitzer Prize for it. The Looming Tower is largely focused on the people involved; what they were like, why they did what they did, and how they interacted.