As the last note of Hail to the Chief reverberates through the crowd gathered at the South Lawn ceremony it is suddenly punctuated by gunfire. An American soldier, a member of the U.S.A.F. Presidential Honor Guard, has assassinated the President of the United States, and gravely wounded the visiting President of Mexico. As Airman First Class Douglas Morgan lies dead on the lush green lawn, the two countries immediately begin to demand answers. The...