Occupied Norway, 1944. Anni endures the war alone, aiding the resistance while longing for news of her sailor husband. Her daughter, Ingrid, is her joy, and Anni is determined to keep her safe. But when a German official is billeted at their home, danger escalates, and Anni faces an agonising dilemma. London, 1952. Ingrid has been trying to understand her mother's mysterious disappearance at the war's end. Clinging to Anni's promise that she would always come back for her, Ingrid sets out to discover what happened all those years ago.