Tom Clancy's Chain of Command - Marc Cameron

President Jack Ryan always feared the greatest threat would be to the nation - from Russia, China or an act of international terrorism. Never in his wildest dreams could he imagine it could be so personal - so directed at him. As the President scrambles to fight back, regain control and save those he loves, the men and women protecting him must work fast to solve three mysteries: Who has the power to do this? Why attack the President of the US? And how can they be found and stopped?