The drama about a young midwife in 1950s-era East London opens with Jenny Lee's arrival at Nonnatus House, a convent of nursing nuns that's a far cry from the private hospital she expected. Her first case: caring for a woman who's on her 25th pregnancy.
New arrival Chummy is welcomed by Jenny, but she gets off on the wrong foot with Sister Evangelina due to her inability to ride a bike and her overwhelming desire to please. In other events, Jenny meets a pregnant young runaway.
In the Season 1 finale, Sister Monica Joan develops pneumonia and is later accused of theft, with the real possibility that she could be sentenced to jail causing much concern within the Nonnatus House community. In other events, Chummy's mother visits in order to meet her new beau.