Story is based on the life of Martha Cnockhaert, a Belgian girl who was an Allied spy in the World War. A reproduction of the Belgian village, where most of the action takes place, is most realistic, and the German troops of occupation, headed by Kommandant Conrad Veidt, are fine. Their military equipment is remarkable.
The acting honors go to Madeleine Carroll as the fine-spirited young girl. Veidt as the head of the German troops looks his part; Edmund Gwenn makes a realistic burgomaster; and Herbert Marshall is a first-rate Herbert Marshall.