After 9/11, the United States made one of the most secretive and dangerous deals in its history. The evidence against the powerful Saudis who coordinated the attack would be buried. In return, King Faisal would promise to keep the oil flowing and deal with the conspirators in his midst. When the king's own nephew is discovered to be funding ISIS, the U.S. president suspects that the Saudis never intended to live up to their agreement. He decides that...