Christmas, 1968. All eyes are heavenwards as astronauts embark on their latest space exploration. But events on Earth continue to unfold at Nonnatus House. With Apollo 8 poised to orbit the moon, Sister Monica Joan believes this will be her last Christmas and decides she will not live to see a man walk on the moon. The Nonnatus Family rally round to lighten her mood. Nancy recommits to staying on and Sister Julienne offers her and Colette a room for the foreseeable future. Fresh from their honeymoon, Trixie and Matthew prepare their first Christmas as husband and wife when Trixie's brother Geoffrey pays an unexpected visit. And Nurse Crane, away on her refresher course, gets home in time for Christmas despite treacherously heavy snowfall.