When Victoria Davies offers Hezekiah an unusual proposal, he realises that London isn't done with him yet. Elsewhere, a familiar foe returns. And just as Mary makes her next move, the male elephants discover who shot their leader. A battle ensues.
The Nonnatus team grow increasingly concerned for the welfare of four young children. Sister Catherine faces her first solo delivery, and the midwives attend a women's lib meeting.
Pine gains Teddy's trust and secretly finds the proof he needs to connect the Cartagena shipment to covert British intelligence interests. But then things start to go wrong.
In a case centered around the fledgling world of psychiatry, a violent psychiatric patient is on the loose, leaving behind a murder, a mystery and an unidentified body. Blake hires Eliza to help him solve the case.
Hana and Brody set a trap to catch Fox, Jess enlists surprising medical help to save Ruth's life, and the true architect of the conspiracy is finally revealed.
