More determined than ever to fight against their German occupier, 14-year-old François and his friends team up with a British spy who sends them on increasingly dangerous missions. Meanwhile, the war itself intensifies as the USSR and the U.S. join forces to fight the Nazis, and the children try to figure out what the various political parties are about, and what will be at stake when the war is over. In France, antisemitism continues to grow, and the Communist Party launches the first armed attack against the occupying forces.