Bertie learns that he is now Lord Hexham as his cousin has died in Tangiers. Mary finally grasps the truth about Marigold and just as Bertie and Edith are about to announce their engagement, Mary tells Bertie that Marigold is Edith’s daughter. Shocked, he decides he cannot trust Edith and they separate. Edith and Mary have a vicious row, but after a heart-to-heart with Violet, Mary reconciles with her sister.
Henry turns up at Downton in a bid to win back Mary, but she rejects him again. However, her conversation with Violet changes her mind and she and Henry reconcile and get married.
Thomas’s misery increases and he slits his wrists in the bath, but Andy and Baxter manage to save him.
Mrs Patmore is horrified when she learns that an adulterous couple have stayed at her B&B and that her good name has been sullied, but the Crawleys try to give her some good publicity by going for tea at the establishment.
While Daisy passes her exams with flying colours, Molesley starts teaching at the school. His first day is a disaster but he soon wins over his pupils.