Debt of Honor.
Japan has a "shadow war" with the U.S., crippling both the Pacific fleet and the U.S. economy through some really sneaky moves, then shows utter incompetence in actually following through, and gets their ass handed to them by Jack Ryan and company. Vice President resigns due to scandal, Jack Ryan is sworn in as Vice President, then a Japanese 747 crashes into the Capital building, wiping out most of Congress and the President. Jack Ryan becomes President.
The story itself was pretty bad, but the ending bit where Secret Service agents on the roof of the Capital building try to shoot down a 747 with Stinger missiles is kind of telling - it's like trying to take out a charging bull with a BB gun.
