Anna Neagle in the title role and Edna May Oliver as the Countess de Mavon are on great form in this authentic looking biopic of the first world war nurse who ran a small hospital in Brussels. The two women quickly establish a network to help prisoners of war escape home via Holland, but it doesn't take the Bosch long to discover what's going on and the stiff necked sophisticate, "Capt. Heinrichs" (George Sanders) leads the investigation into their increasingly perilous activities. The outcome is the stuff of history, and the story stays tragically faithful to that - Herbert Wilcox tells the…