Hannah represents a woman fighting to save the embryos created during a marriage that is now ending in divorce. Oscar’s return continues to have an impact on the entire family.

An online illicit dating website is hacked, providing Hannah with an explosive case. At home, Ruth hosts a dinner party for all the family with disastrous consequences.

Hannah, for so long adept at navigating other people's lives and relationships, is confronted with painful questions about her own marriage.

Maya, Oscar's second wife, finally arrives in London. But as the family try to heal divisions and look to the future, Hannah and Nathan are still fighting to save their marriage.