1918: The Great War is over, and Clara Carter has boarded a train bound for Cornwall - to meet a family that would once have been hers. 1939: Hannah has always been curious about her mother's mysterious past, but the outbreak of the Second World War casts everything in a new light. 2020: Caroline has long been the keeper of her family's secrets. But now, with her own daughter needing her more than ever, it's time to tell the truth