Frank, the brother of Peggy, the cleaner at Nonnatus House, is diagnosed with cancer. Jenny and the nuns are called upon to provide him with care, and in doing so Jenny comes to know the siblings better, learning of their upbringing in a workhouse and the profound effect it has had on their relationship. As Jenny tends to Frank, the other residents of Nonnatus House find themselves involved in helping Fred with his latest money-making venture – a pig called Evie. Fred's plan had been to make his fortune from bacon, but this is scuppered when they realise the pig is pregnant. The nuns and nurses help out Fred and Evie in the manner they know best.