Russia presses the White House, while Jack must try to thwart the Chinese and his oldest antagonist simultaneously.

A missing computer circuit board: the Russians get wind of Chinese espionage, the White House must find a leak, and CTU interrogates an unlikely witness.

Jack baits Fayed with Gredenko, while the President faces a challenge to his office.

Jack’s search takes him to the home of an old enemy, while a bomber slips into the White House.

Jack looks for a Russian national as his father plots with shadowy patriots. Meanwhile, the President and the Constitution may be in danger.

While Jack has problems with Curtis, CTU discovers a nuclear threat and raids a terrorist warehouse, and a shocking explosion shakes LA.