France, July, 1944: In the Pas de Calais, Nathalie Mercier, a young British Special Operations Executive secret agent working with the French Resistance, disappears. In London, her husband Owen Quinn, an officer with Royal Navy Intelligence, sets off on a perilous hunt through France in search of his wife. With the help of the Resistance he finds Nathalie, but then the bitterness of war and its insatiable appetite for revenge catch up with them in a dramatic fashion.