It is called the flying White House, the most tightly guarded airborne fortress in the world . . . until now. Terrorists have seized Air Force One thirty thousand feet above the earth. The president, the first lady, their thirteen-year-old daughter, and more than fifty innocent people are on board. The terrorists threaten to execute a hostage every thirty minutes if their demands are not met. The official word from Washington: No negotiations. Time is running out. . . .