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Season 4 opens six months after Matthew's death with Mary and Isobel in deep depressions. In other events, O'Brien causes a crisis; Violet tries to help Molesley gain employment; and Thomas takes a dislike to the nanny.
The Crawleys host a party for friends and acquaintances, including Lord Anthony Gillingham, who has eyes for Mary, and Gillingham's valet, who is attracted to Anna. Gregson, meanwhile, hopes to impress Robert, who seems intent on ignoring him.