Warsaw, 1937. The Nazi military machine is ready to roll at any moment; the city is flooded with German, Russian, and Western European spies. In dark corners and on grim streets, nations have unofficially already entered the war, involved in a brutal battle of intrigues, betrayals and abductions. Colonel Jean-Francois Mercier, a decorated war hero, serves as military attaché at the French embassy in Warsaw. Playing the role of a charming ambassador, Mercier finds himself captivated by Anna, a Parisian lawyer for the League of Nations, but beyond that he plays a secret role – a bold spy determined to uncover the plans for a German invasion. As the war draws closer, Mercier's mission leads him to Germany, to the very heart of the Nazi operation. While chaos in Warsaw intensifies, his passionate romance with Anna takes on a destructive course of its own...