Nonnatus House faces its darkest day after a tragic incident in the heart of Poplar. As the community rallies together, the team must overcome personal anguish to help the injured.

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.

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.

Sister Julienne cares for an expectant mother who has cerebral palsy. Nonnatus House kicks off its new midwifery training scheme with the arrival of four new pupil midwives.