Operation Encore and the Saudi Connection: A Secret History of the 9/11 Investigation — ProPublica

Operation Encore and the Saudi Connection: A Secret History of the 9/11 Investigation — ProPublica: Behind the scenes, a small team of FBI agents spent years trying to solve a stubborn mystery — whether officials from Saudi Arabia, one of Washington’s closest allies, were involved in the worst terror attack in U.S. history. This is their story.