1940. Guernsey has been bombed, and is now occupied. A year earlier, recently married Helene waved goodbye to her husband, who enlisted in the British army. As Helene carves out a life on the island over WWII, she learns that living with the enemy is a messy business.
Forty years later, her daughter Roz begins a search for the truth about her father, and stumbles into the secrets of her mother's life.