Gishle Duchant guards a secret that could cost her life. Tunnels snake through the hill under her family's medieval chateau in Normandy. Now, with Hitler's army bearing down, her brother and several friends are hiding in the tunnels, resisting the German occupation of France.
But when German soldiers take over the family's chbteau, Gishle is forced to host them as well-while harboring the resistance fighters right below their feet. Taking in a Jewish friend's baby, she convinces the Nazis that it is her child, ultimately risking everything for the future of the child. When the German officers begin to suspect her deception.