In the episode, the fate of Downton Abbey hinges on a letter from a dead man, while Edith and Sir Anthony face their own fateful moment.
Meanwhile, Mrs. Hughes confronts a crisis.
Watch a sneak peek below:
Shirley MacLaine joins the much-loved cast of DOWNTON ABBEY this season, which includes Maggie Smith, Elizabeth McGovern, Hugh Bonneville, Dan Stevens, Michelle Dockery, Jim Carter, Penelope Wilton, and a host of others.
Written and created by Julian Fellowes, DOWNTON ABBEY, Season 3 marks the return of one of television's most beloved and anticipated drama series to MASTERPIECE on PBS.