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At Christmas 1919 the Crawleys welcome Edith's former suitor Sir Anthony, now a war invalid, who tells her that he is too old for her, and Robert's sister Rosamund with her beau, the raffish Lord Hepworth. Sybil writes to announce her pregnancy. After Carlisle's selfish attitude towards the servants and his jealousy when Mary accompanies Matthew to visit Lavinia's grave, Robert prises from his wife the fact that the newspaper baron is effectively blackmailing his daughter into marriage to keep her secret and, on her father's advice, Mary breaks off the engagement, knowing that the angry Carlisle will now probably expose the family. Aware that Hepworth is penniless, Violet unsuccessfully tries to warn Rosamund against marriage but Rosamund is determined to go ahead with the wedding - until she catches her fiancé in bed with her maid. Things do not go well for John, on trial for killing Vera, though Robert and Matthew vow to contest his life imprisonment. Upstairs and downstairs at Downton are all shaken by his fate, even O'Brien, though Thomas schemes to ingratiate himself and become the new valet. On the eve of the servants' ball, Mrs Patmore uses a little chicanery - and a Ouija board - to help Daisy assuage her guilt over William whilst at the ball itself a long overdue marriage proposal is made - and accepted.
- Writers: Julian Fellowes
- Stars: Allen Leech , Brendan Coyle , Dan Stevens , David Robb , Elizabeth McGovern , Hugh Bonneville , Jim Carter , Joanne Froggatt , Kevin Doyle , Laura Carmichael , Lesley Nicol , Lily James , Maggie Smith , Michelle Dockery , Penelope Wilton , Phyllis Logan , Raquel Cassidy , Rob James-Collier , Siobhan Finneran , Sophie McShera