Aired in 2017, this episode sees the staff of Nonnatus House returning from South Africa to a colder, harsher London.

Extortion threats surface for Mary, while the staff faces the reality of a changing world where grand estates like Downton are becoming harder to maintain.

Stars Hugh Bonneville, Laura Carmichael, and Jim Carter. Call the Midwife (Season 6, Episode 1)

This episode aired in 2015 and marked the beginning of the show's final season.