McCord tries to persuade senators on a landmine treaty by hosting a holiday party, while Henry attempts to prove that the senate majority leader colluded with the Russians by exchanging information.
McCord and a retired UN ambassador work together with the Russian Foreign Minister to contain a potential smallpox outbreak after a Russian dissident flees to the United States.
Emotions run high among the staff as the 20th anniversary of the Ugandan embassy bombing approaches. Elizabeth must subsequently decide whether or not the US should lift its sanctions against Sudan.
A summit meant to solve territorial claims at the North Pole is attacked by an activist group and their bomb; Henry helps a student.
Hannah reaches out to her friends for advice after an important meeting, but has trouble reaching Marnie.