Jenny is seconded to the short-staffed London Hospital to work on the male surgical ward. Initially hesitant about her temporary assignment, she becomes increasingly reluctant about her new duties when she finds herself working under an intimidating surgeon, Mr Tracey.
Back in Poplar the midwives have a new addition to the household, Jane, who lends a hand in Jenny's absence. In one of their most unusual cases, the nuns and nurses are introduced to a forthright pair of twins, Meg and Mave Carter. The two women are identical in every way - they even share a husband - except one of them is now pregnant. As the pair come to terms with the impact that a baby will have on each of them, Jenny unexpectedly helps to save the life of an old friend.