In Nazi-occupied France, the assassination of a new German commandant by Amalie de Gruchy sparks a crisis in both Nazi Germany and the British secret service. Supposedly killed in a raid a few months previously, Amalie is now being pursued by, amongst others, the head of the German secret police and the mysterious Joanna Jonnson, a spy with a murky past. Amalie's beautiful sister, Liane de Gruchy - also thought to have been killed months before - comes out of hiding to help in the search for Amalie. But soon the Resistance finds itself with a much bigger problem as the Germans uncover British plans which, in the wrong hands, could change the course of the war.