Nonnatus House welcomes two new nuns. Valerie deals with a shocking case that arrives unexpectedly, and the other midwives must handle a complicated multiple birth.

Mother Mildred decides it’s time for Sister Frances to attend her first solo birth. Trixie consoles a patient who discovers she has gonorrhea.

Sister Hilda digs deep to give her terminally-ill patient her final wish whilst the Turners must prepare to say goodbye to May. Fred and Reggie are keeping secrets from each other.

Sister Julienne decides it is time to take matters in hand when a letter arrives from the council saying that it will cut funding to Nonnatus House and no longer pay for the accommodation, and goes to see Violet at one of her open sessions as a local councillor.

The circus comes to Poplar, putting a magical spell on its residents. A delighted Shelagh is reacquainted with an old friend, and Trixie receives an unusual gift.