Tom Clancy's Chain of Command

Note: This is a second hand, gently read book in mostly good condition. The upper right corner of the cover has some creases but they don't really affect the book much.  Everything else is in good order.

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A plane is intercepted flying at the Whitehouse. The Vice-President collapses and dies. And a plan is launched to kidnap the First Lady . . .
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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? . ..