Mr Carson and Mrs Hughes' wedding is fast approaching, but a misunderstanding threatens to derail the occasion, and when the big day arrives it also brings a few unexpected guests. Meanwhile, Edith reconnects with an old acquaintance, who comes to her aid in her hour of need, and over at the Dower House, Spratt has something to hide, meaning Denker is hot on his trail. Daisy jumps to conclusions over one of the countess's plots, and tensions mount over the hospital takeover, prompting Isobel to offend a friend.