Shall We Tell the President? - Jeffrey Archer

1983. Edward Kennedy is President. On March 3 at 7.30 the FBI learn of a plot to kill the President the 1572nd of the year. An hour later five people know all the details — by 9.30 four of them are dead.

FBI agent Mare Andrews is left alone. He knows when. He knows a senator is involved. He has six days to learn where — and how. Six days to prevent the certain death of the third of the Kennedys.

COUNTDOWN TO AN ASSASSINATION