“Madame Fourcade’s Secret War” tells the  little-known  story of Marie-Madeleine Fourcade, the woman who headed the largest spy network in occupied France.   No other French spy network lasted as long or supplied as much crucial intelligence–including providing American and British military commanders with a 55-foot-long map of the beaches the Allies would land on D-Day. The Gestapo pursued them relentlessly.  Fourcade  moved her headquarters every few weeks, constantly changing her hair color, clothing, and identity. She was captured twice but managed to escape. France, slow to confront the stain of defeat and German collaboration, has been slow to honor her.  Lynne Olson’s story “should challenge any outdated assumptions about who deserves to be called a hero” (Washington Post).