Sister Monica Joan is rushed to hospital, while Trixie is less than impressed to receive a subscription to a Marriage Bureau as a Christmas present. Meanwhile, the circus is in town.

Sister Frances finds herself in a tricky situation when a pregnant woman confides in her. Cyril helps a family find shelter after they are evicted from their home. Sister Julienne's new venture hits a stumbling block.

Sister Hilda and Doctor Turner are involved with a young woman whose health presents a series of challenges. A complicated pregnancy leads the Nonnatus House team on a path of discovery.

As the World Cup draws near Fred places a risky bet on the final. Nonnatus House welcomes four new pupil midwives, Dr Turner meets a 17-year-old boy harboring a desperate secret, and Cyril and Lucille's relationship continues to blossom.