Tom and Sybbie return to Downton, but the peace is disrupted by an unexpected visit from an old and dear friend. Baxter is faced with a dilemma after an encounter with Sergeant Willis, while Thomas struggles to fill Carson’s shoes as butler. The newlyweds Mr and Mrs Carson return from their Scarborough honeymoon. Anna goes to London with Mary to deal with a crisis regarding her recent pregnancy, while her secrets seem likely to be exposed to Mr Bates. Daisy is not happy with Cora’s attempts to help her father-in-law, and Mary has an admirer.