The midwives face one of their busiest nights to date, whilst Sister Winifred concentrates her efforts on the prostitutes of Poplar. Elsewhere, cracks start to appear in Trixie and Tom Hereward's relationship.

A young diabetic girl faces heartbreak when she falls pregnant as a result of a clandestine romance. Elsewhere, the midwives become involved with a settlement of Irish Travellers and Sister Mary Cynthia delivers her first baby since becoming a nun.