When Roberta finds a letter inside her centenarian grandmother’s battered old suitcase that hints at a dark secret, her understanding of her family’s history is completely upturned. Running alongside Roberta’s narrative is that of her grandmother, Dorothy, as a 40-year-old childless woman desperate for motherhood during the early years of World War II. After a chance encounter with a Polish war pilot, Dorothy believes she’s finally found happiness, but must instead make an unthinkable decision whose consequences forever change the framework of her family.