The year is 1920, and the whole house is preparing for the wedding of Mary and Matthew. However, it doesn't take long before plans start to unravel. Matthew is told that he will inherit money from his late ex-fiancee Lavina, but being the perfect gentleman, he refuses to accept the money on the grounds that he broke her heart. But his thoughtful decision infuriates Mary. She reveals to him that her father Lord Grantham is short of money and this could save Downton. As the wedding looks in doubt, Cora's outspoken mother, Martha Levinson arrives and soon clashes with the Dowager. Meanwhile, Anna heads off to visit Mr Bates in jail and insists she will secure his freedom. But back at the house, there's a lot of emotional heartbreak. Finally, Mary does walk down the aisle to marry Matthew.
