House of Bush, House of Saud begins with a politically explosive question: How is it that two days after 9/11, when U.S. air traffic was tightly restricted, 140 Saudis, many immediate kin to Osama Bin Laden, were permitted to leave the country without being questioned by U.S. intelligence? The answer lies in a hidden relationship that began in the 1970s, when the oil-rich House of Saud began courting American politicians in a bid for military protection, influence, and investment opportunity. With the Bush family, the Saudis hit a gusher -- direct access to presidents Reagan, George H.W. Bush, and George W. Bush.