Author Graham Greene finds himself in the midst of an intricate plot to unseat the government of Czechoslovakia in an event that would be remembered as The Prague Coup.

Winter 1948, the Czech capital is under occupation by the allied powers. Debriefed by London Films, Graham Greene works on the writing of his next feature film, assisted by the enigmatic Elizabeth Montagu. A seemingly peaceful mission enters into a revolution that history will remember as the "coup de Prague".