The Husbands of River Song

The Doctor is on the planet Mendorax Dellora in 5343, where he is asked by a man named Nardole to follow him, thinking he is a surgeon, on the orders of River Song. A surgeon is required to remove a diamond from the head of King Hydroflax after his maligned attempt to steal it, and River seeks to recover it. Surprised that River cannot identify his newest face, the Doctor struggles to break the news to her while learning how she acts on her own- and how many other lovers she has had. However, both he and River soon find that the time is drawing close for the last page in the diary of their journeys together to be written…