The Turners support a family still suffering the devastating effects of thalidomide, Miss Higgins is involved in an unexpected delivery, and the community stages a talent show.

It's April 1968 and change is coming to Nonnatus House. Racial tensions cast a shadow over Poplar, and the sisters welcome a new recruit.

It is May 1968, and the Nonnatus team are faced with challenging cases, one of which is much closer to home as Lucille struggles with her own health. At a coffee morning for expectant mothers, Sister Julienne meets heavily pregnant Lilian Reynolds, who is expecting her first child. However, after Lilian experiences some breast discomfort, she receives a devastating diagnosis.

Sister Veronica is shaken when a mother reveals a terrible truth about her marriage. Shelagh cares for a baby with a life-threatening condition, and Nancy harbours a secret.

The maternity home is thrown into chaos by an outbreak of gastroenteritis, and Nurse Crane fights to save her career. Meanwhile, Cyril encourages Reggie to seek help.

A pregnant mother with a chronic heart condition falls unwell. Nancy grows suspicious of a young father's erratic behaviour, and Matthew prepares for a visit from his father.

Trixie supports an underage mother through a difficult time, Monica Joan welcomes an unusual guest to Nonnatus House, and Sister Veronica spearheads a new council initiative.

Nancy makes a home visit to Imelda O'Connor, and is surprised that Imelda, her husband Maurice and young son Paul are living in a cramped caravan on a building site.

Dr Turner experiences the biggest test of his career, while Trixie's approaching nuptials cause stress levels to escalate. Sister Julienne hatches a plan to save Nonnatus House.