The pupil midwives reach their third month of training. An anxious Trixie receives an urgent phone call that leads to dire consequences for her patient. Elsewhere, the Turner's Apollo 11 moon landing party is in full swing at Nonnatus House.

It's summertime in Poplar, and during Violet's first event as mayor, a young mother goes into labor. Among the chaos, May sneaks off and Shelagh receives an unexpected visit from her social worker, which puts her on edge.

As the summer ends, the pupil midwives prepare for their final while two little brothers are abandoned at a church. Trixie learns about Matthew's financial woes. Nancy confronts Nurse Crane for her attitude towards the "Raise the Roof" campaign.

Rosalind oversees the care of a teenage mom and uncovers a disturbing truth. Trixie and Matthew struggle with their change in fortune, while Joyce receives an unexpected visitor.

Miss Higgins receives an unexpected visitor, and Sister Monica Joan ruffles feathers. Poplar votes for its Mother of the Year.