Arabella’s obsession with a fellow young author, Della, leads to unexpected progress on her book, despite a devastating setback. Kwame wades into uncharted waters with Tyrone and attempts to make…

Carson is finding it tough maintaining standards in the house, and the suicide of a young officer prompts Isobel to suggest converting Downton Abbey into a convalescent hospital.

Matthew Crawley and his mother Isobel arrive at Downton, and have difficulty settling in. Carson is mortified when confronted by his past. Violet attempts to promote a match between Matthew…