As the war promises to draw to a close, uncertainty still reigns. With its ruined aristocratic houses, rationing, and fallen officers, war's aftermath opens some doors for the present and former servants and slams shut others. Meanwhile, Isobel's post-war plans create an indomitable, if unlikely, alliance. But when a mysterious stranger arrives, Downton faces more turmoil. Sir Richard is anxious to take not just Downton's most beautiful asset, but one of its most treasured as well. In return and against Robert's wishes, he restores a powerful replacement in its halls. And Vera Bates takes startling action.