When France enters World War II, Jean, conceding the need for violent conflict to effect change, becomes a soldier. Hélène intervenes against his will to arrange a safe posting for him. Angry with her, Jean breaks their relationship. As the German forces advance towards Paris, Hélène flees and witnesses the suffering of other refugees. Returning to Paris, she briefly takes up with a German who could advance her career, but soon sees what her countrymen are suffering. She also witnesses the roundup of Jews. Securing the safety of her Jewish friend Yvonne leads Hélène back to Jean, who has become a leader in a Resistance group. She is moved to join the group. Jean has reconnected with his father with the common goal to liberate France from Germany. His mother, however, is less impressed by the lives lost to the Resistance.