In 1942, the Nazis come for a Jewish family living in Montparnasse, occupied Paris. In the chaos of their arrest, eleven-year-old Josie flees to the only person she trusts: her piano teacher, Andrée Levallois, secretly an operative in the French Resistance. Andrée takes her in as a member of the family, spreading their rations and risking everything to keep her safe. But soon the authorities close in, and both Andrée and Josie are caught in a desperate race to stay alive.