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.

Albert Hauptmann is an out of work waiter in Cologne who is often confused with a former Captain of the Nazi Army. Albert uses this to his advantage and becomes the Director of the Montan Corporation, and a member of the West German Parliament. Herr Karjanke, the real Captain, learns of Albert’s ruse, and wants to claim his "rightful" position in Parliament. But Karjanke cannot come forward until his politicking "Doppelganger" succeeds in passing an amnesty law for war criminals. When Albert is finally brought before a judge on charges of fraud, he learns that this own amnesty law does not apply to him.

Shortly after the seizure of power by Adolf Hitler at the beginning of 1933, preparations were underway to silence the members of the socialist and communist parties.

The Luisin ridge is divided not only by the river, but also by the zone boundary. The old CEO Högler still lives in the west, the eastern part has been expropriated and is managed by the chief engineer Dr. Tellen. He is working on a new steel production process that Högler absolutely needs. Högler's means to achieve his goal are bribery, espionage and slander. Trade union member Maria Steinitz almost becomes a victim of slander. However, the intrigue is exposed and Hogler's criminal intentions are thwarted. At a large production meeting, the old people's controller Hufland exposes the true culprits. Maria and Fritz Rottmann, a trade unionist from Munich, who have known each other since the days of the anti-fascist resistance, embrace each other.