Magdalena and Michael have loved each other since they were children. But when the Nazis come to power, Michael rebels against the regime and is sentenced to fifteen years in a concentration camp. Magdalena, meanwhile, goes underground with the help of a friend and later immigrates to the Soviet Union. Michael, who has joined the Red Army, discovers on the way to Moscow that Magdalena is staying there. But when his plane lands, she is already on her way back to Germany. Michael hopes that one day, he and Magdalena will be reunited.

Berlin, 1936. Athletes and visitors from all over the world have come to the city to take part in the Olympic Games. Anti-Fascists use the opportunity to tell the foreign guests about the situation in Germany by distributing leaflets. Being cornered by the Gestapo, the wounded resistance fighter Jakob manages to go into hiding with the help of the Swiss doctor Thea. They fall in love with each other and when Jakob joins the International Brigades in Spain to fight against Franco, Thea follows him and becomes a dedicated fighter against Fascism. The enduring battle, however, keeps preventing them from becoming a real couple.

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.

This film continues the story of radio operator Ludwig Bartuschek from “The Sailor’s Song”. Near the end of the Weimar Republic, Bartuschek (Erwin Geschonneck) is working as a mechanic in the Sperber airplane plant. Director Dehringer offers him the opportunity to train as an airplane constructor if he is willing to give up his communist beliefs under oath. Bartuschek will not allow himself to be bought and instead joins the underground resistance movement.