S4, E1: Following Matthew’s untimely death, new mother Mary is struggling to come to terms with her loss. Robert and Violet disagree on how to bring her through it. Downstairs, hearts are set to be broken as Jimmy finally takes an interest in Ivy. Carson has an unwelcome reminder of his past while Mrs Hughes sees an opportunity to help grief stricken Isobel. Thomas is up to his old tricks and has the children’s Nanny in his sights.