Elise Henderson is a Special Operations Executive radio operator. She is parachuted into southern France in May 1944 to track and report on the movements of the 2nd SS (Das Reich) Panzer Division which is there recuperating from the Eastern Front. The Allies know that when the D-Day landings commence, the division will be moved north. Whilst resting and refitting, the division has been 'keeping its hand in' by participating in the suppression of the French resistance (Maquis).
Elise waits for the D-Day landings to occur and then starts her mission. What she witnesses changes her forever.