Moffat told Collider: “Mark [Gatiss] will be starting [to write] very soon. He may have started. I’ve got to finish my Doctor Who বড়দিন special, and then I’ll be straight onto Sherlock after that.”
During the লেখা of "His Last Vow", Moffat also wrote a scene about what Sherlock and Irene did after he rescued her from the terrorists in Karachi. However, the scene was never meant to be filmed.