Dr Turner and Nurse Crane must deal with an alarming outbreak of diphtheria. Fred finds an abandoned baby in a dustbin, and the team must help locate its mother.

Sister Julienne cares for a pregnant prostitute, while Dr Turner puzzles over a mysterious string of symptoms.

Lucille is seconded to St Cuthbert's when a ward sister is off sick, but a lift malfunction sees her spend the evening with mother-to- be Connie instead of her planned rendezvous with Cyril.

Sister Julienne volunteers to put up four trainee doctors at Nonnatus House while they undertake the practical aspect of their obstetrics diploma, hoping the exercise will remind the council how vital the home is to the community and help remove the threat of demolition.

Sister Frances is at a loss when she cares for diabetic and recovering cancer patient Albert Calthorpe whose fiercely independent wife Grace refuses to accept further help, despite caring for her husband, her elderly mother and her pregnant daughter.

At the Turners, Shelagh receives a phone call from the Hong Kong adoption agency, which has the alarming news that someone from May's past has arrived in the UK and wants to see the little girl.

Trixie helps a blind mother, Marion, care for her new baby, but trouble starts when Marion’s sister calls Social Services to intervene.