This film is the first of a two-part historical and biographical portrait of the communist politician and anti-fascist Ernst Thälmann. In early November 1918, Ernst Thälmann is an unwilling soldier serving on the western front. As the revolutionary movement at home is threatened by the betrayal of the Social Democrats and fissures in the working class, Thälmann calls on his fellow soldiers to put down their weapons and unite with the workers in the communist struggle at home. Thälmann’s qualms about which side he is fighting on continue, but when the local police attempt to prevent a shipment of provisions and supplies from reaching the people in Petrograd, he intervenes and the ship is unloaded. With this moment of clarity, Thälmann continues to follow his political convictions and joins the workers at the Hamburg uprising in October 1923.

Professor Sonnenbruck is a scientist who is not particularly interested in politics. Even the meeting in 1943 with his former assistant Peters does not change him. He does not betray Peters, who has escaped from a concentration camp, but that is already enough for him. But after the war Sonnenrbruck gets into a conflict of conscience. He thought that science was finally free of politics again only to find the opposite happening at his university in Göttingen. A medical congress in the GDR brings him together with Peters, who is working on a major research contract there. Sonnenbruck decides to visit Peters.

The authorities expect the case of Friedel Walter, alias "Dr. Mueller," to be a straightforward one: he was working as a doctor without proper credentials under a false name. But Mehlin, the man in charge of his case, knows that there is more to the story. When he was injured fleeing from a concentration camp, resistance worker Irene asked her medical student boyfriend Walter to give him medical care.

19-year old Peter is working to gain practical experience for his planned medical studies. But his life turns into confusion as he unexpectedly comes a father.

„White mouse“ Fritz controls the traffic on Dresden’s Körner Square. Helene, who crosses the junction on her motor scooter every day, has taken a shine to Fritz a long while ago. Although Fritz yields right-of-way to her remarkably often, the two have not spoken to each other. In order to finally get to know him better, Helene deliberately performs a traffic violation. Her plan is working: She is ordered to take road safety education lessons from Fritz and they get closer. New problems arise in the shape of Mrs. Messmer who must pay a monetary fine. She feels discriminated against by Fritz and complains about him to his supervisor.

Professor Heger's son was shot by the Gestapo during the war. Dr. Bram was also responsible for his death. After the war, working in Heger's clinic, Bram tells the professor about his guilt. Considering Bram a traitor, Heger refuses to work with him. Bram flees to West Germany. Soon the professor, who has decided in his heart to stay in the FRG forever, leaves for Munich for the congress. But his meeting with Bram in Munich and the reality surrounding them dispelled his illusions, and they both return to their homeland.

In the Werra valley near the border is one of the five soda factories of the GDR that once belonged to the powerful Solvay group. After the war, they moved the headquarters from Berneburg to Frankfurt, but some people loyal to the groups bosses remained to sabotage the production in the now nationally owned factory.

The magnificent cow Senta has escaped from an LPG. Matuschek, a single farmer, joins the search. However, the valuable animal is not found and is believed to have strayed across the border into Poland. Meanwhile, Senta is in Matuschek's barn. His maid Mathilde and neighbor Dattelmann have captured her and brought her there. Matuschek conceals a letter to Poland because of the supposedly border-crossing cow and is embarrassed when the cattle farmer Franze Flohr discovers the cow in his barn. Nevertheless, Matuschek and Franze become a couple who also become closer to the LPG.

Germany in 1949: The residents of the Thuringian village Hunsdorf are still heavily influenced by archaic superstition and explain unusual events with preternatural powers. The same happens when pigs again and again disappear from different farmyards. The village residents firmly believe that witches are the reason for this mystery. Not even police detective Kühlemann who is sent to Hunsdorf is able to dissuade them from their superstition. Thus, the farmers think his investigation is aimless and they do not support him at all. With a lot of patience and well-made arguments he finally convinces little Peter that there are no witches. Next, Peter’s grandfather and teacher Marianne take Kühlemann’s side. With their support, the police detective eventually finds out the truth and is able to put a stop to the gang of crooks that had been stealing the pigs.

A Saturday evening dance in the village pub is interrupted when the barn of local farmer Paul Gäbler catches on fire. The farmer himself is soon found – hanged. Sawmill owner Züllich claims that Gäbler committed suicide because he was forced to join an agricultural production cooperative, but others are convinced Gäbler was murdered. Officers Schneider and Anders must navigate their way through a complex maze of personal and political motivations in order to reconstruct the crime.

Schwalk, the new shaft foreman of a road construction brigade, is a go-getter and used to success - both at work and with women. But this time things don't go so smoothly. Although he initially has an easy time with the brigadier Erika, who falls in love with him, things come to a head at work. His ambition to win a competition causes him to slip up during road construction. Erika is outraged by his selfish behavior and suspects that he is just looking for an erotic adventure with her. She turns her back on him. However, Schalk recognizes his mistakes and does everything he can to make up for the damage - to the building site and to Erika. The road is handed over on schedule.