Who will Lady Mary marry? The answer to this question may not be revealed soon. However, Lady Mary "comes to a decision regarding Lord Gillingham," according to the synopsis of Episode 4 of "Downton Abbey" Season 5. In the previous episode, Lady Mary and Lord Gillingham spent almost a week together in a hotel in Liverpool, away from the watchful eyes of Mary's family. In addition to talking, walking around the city and dining, the two also spent a considerable time in the same bed. The two parted on a happy note. However, later at home, Mary told Tom that she is not sure if Lord Gillingham is the right man for her. In Episode 4, things don't go as planned between Mary and Lord Gillingham.

Mary may not decide in favour of Lord Gillingham, as according to the synopsis of episode 5, "Mary is going to be surprised by Charles Blake in London with a cunning plan." In addition to Mary's decision regarding Lord Gillingham, the episode 4 will also reveal the truth about Violet and Prince Kuragin's past. Violet will be seen telling Isobel the "surprising truth of her past" with the Russian.

Rose's father, Shrimpie, makes an appearance in episode 4. He will be bringing with him some news that is going to shock the Crawley family. The father's arrival may see the departure of Rose from Downton. According to reports, Lily James, who plays Rose, will not be returning in Season 6 because she is playing the titular role in Disney's "Cinderella."

Also in Episode 4, Ms Bunting will be doing what she does best, shocking and making some people furious by voicing her strong views. The synopsis of the episode suggests that this time "she may have gone too far."

Last episode saw Thomas making a mysterious phone call. He was asked to choose his own path. In Sunday night episode, he will be seen suffering from an "inexplicable illness." It is Baxter who will suspect that Thomas is hiding something.