1944: Geneviève and René live in occupied Paris. They love each other, and the young woman looks fearfully at René's activities in the Resistance. She wants to stay out of it, and sometimes there are arguments about it. After one such argument, René goes to a meeting with a German comrade. While he is away, the Gestapo come to the house to take the resistance fighter Louise away. Geneviève intervenes and is arrested. The men of the resistance are very worried as she knows about a planned bridge demolition. René trusts her, and Geneviève does indeed withstand the torture. The bridge can be blown up as planned, contributing to a decisive defeat for the German army.
