It's December 1968. The countdown to Christmas is on, as is the launch of Apollo 8's moon mission. Sister Monica Joan is convinced this could be her last yuletide and that she will not live to see man walk on the moon.Meanwhile, as Shelagh and Dr Turner navigate family life, they are unsettled when a parcel arrives from May's mother in Hong Kong.Sister Julienne makes a very generous offer to allow Colette to move into Nonnatus House for the foreseeable future. Nancy is thrilled to be able to spend every day with Colette and be more present in her upbringing.