November 1918. A Canadian officer, badly disfigured by burns, asks to be brought to Downton, claiming a relation to the family. Lord Grantham agrees, assuming he is some distant relation, sharing common ancestry but he stuns everyone by declaring that he is Patrick Crawley, the supposedly deceased heir. His story is that he survived the Titanic disaster but suffered from amnesia so he was unable to identify himself and lived as a Canadian until a wartime experience restored his memory. Most at Downton vehemently deny the possibility even though he remembers many details that only Patrick is likely to have known. However, Edith believes him, growing attached to him as he claims that he was always in love with her, rather than Mary. But, Lord Grantham's investigation casts doubt on the Canadian officer's claim, revealing that Patrick Crawley had a friend who emigrated to Canada. This leads to the burned soldier's sudden departure; he leaves behind a note for Edith that is deliberately ambiguous as to his identity.
Meanwhile Matthew is getting used to his condition, constantly cared for by Mary, but Sir Richard Carlisle is strongly displeased by her continued interest in Matthew. Carlisle and Cora conspire, to Lord Grantham's disgust, to bring back Lavinia, who then resolves that she will never leave Matthew. Cora is worried about Isobel's aggressive management of Downton Abbey as a convalescent home until Violet slyly directs Isobel to the plight of refugees as a cause that has greater need of her nursing skills than the convalescent duties. Ethel hears the distressing news that Major Bryant has been killed.
Carson debates whether to accept Sir Richard's tempting offer to leave Downton and be the Carlisles' butler after Sir Richard's marriage to Lady Mary; at the same time, Sir Richard makes it clear to Mary that he is uncompromising.
Lady Sybil receives an ultimatum from Branson regarding his marriage proposal to her. Bates is shocked to find the legality of his divorce threatened, as Vera reveals that he paid her to leave him, and he goes to London to make another attempt to settle matters with her. Upon his return, he receives the news that she is dead. Soon afterwards, the war ends with the Armistice.
Did Bates kill his wife? Will Matthew walk again? xx