Sister Monica Joan is found wandering near the docks and returned to Nonnatus House by the police.
Her adventure takes its toll and she succumbs to pneumonia. Eventually she recovers, only to find herself in trouble with the law when she is accused of theft. As the case progresses to trial, everyone fears that Sister Monica Joan could go to jail.
Chummy has further worries when her mother makes a trip to inspect her new ‘beau’. The visit isn’t a success and Chummy suffers a crisis of confidence, breaking off her relationship with PC Noakes. Jenny and the other midwives pull together to convince her she’s making a mistake.