The first three series of the BBC drama adapted from Jennifer Worth's memoirs about a group of midwives working in East London in the 1950s. Jenny Lee (Jessica Raine) gets her first job at Nonnatus House which she soon realises is a nursing convent and not a hospital, as she had assumed. As she begins caring for patients, she gradually becomes accustomed to her new environment, making friends with fellow midwives Cynthia (Bryony Hannah), Trixie (Helen George) and the clumsy Chummy (Miranda Hart). In series two, it's 1958, and while Jenny has her hands full dealing with an abused patient, Trixie and Sister Evangelina (Pam Ferris) are forced to board a Swedish cargo ship to tend to the captain's pregnant daughter. In series 3, set in 1959, the midwives temporarily find themselves without a place to work when an unexploded bomb is found near Nonnatus House. Meanwhile, Sister Winifred (Victoria Yeates) attempts to settle in to life at Nonnatus and Chummy arranges for Princess Margaret to visit to raise awareness of their weekly clinics.