The "Fiery Arc" tells of a grandiose battle on the Kursk Bulge in the summer of 1943. Here was the largest tank battle in the history of World War II. Along with the personal fate of the heroes, the film shows battle scenes, the activities of headquarters and intelligence, those who worked at the front and in the rear.

The "Concordia" trading company in Würzburg is a secret headquarters of the MID, a secret service agency of the US Army. For years, espionage, sabotage, and diversion operations originated from here in order to undermine the Socialist Republic of Germany. A favorable moment for a military attack approaches and plans are developed. These plans are placed in the hands of Major Collins, who keeps them in a safe. Hansen has worked for him for many years, but also for the Stasi as a double agent. Security Chief Colonel Rock knows there is a leak, but Hansen has passed every test thrown at him. He is trying to deal with his current assignment: acquiring the plans so they can be made public. His mission is to get them out of the safe and into the GDR without getting caught.

In the late 1950s, the collectivization of agriculture is in full swing in the East German village of Willshagen on the German-German border. Those in charge have to face many obstacles, especially from a large-scale farmer who is unwilling to join the co-op. All of a sudden, mysterious men in a fancy car appear in the village and show an interest in the rundown manor house. Gossip spreads quickly, and some villagers think there will be a re-parceling of properties and a land swap with West Germany. They assume everything will go back to how it used to be and even expect the count to return to his manor. In preparation, the situation in the village escalates at a fevered pitch.

As the end of the Second World War approaches and the Soviet Red Army is advancing, a group of concentration camp inmates is helped to escape by a Polish doctor. They hide in a wood where they meet other fugitives, who have been there for months, constantly in fear of being discovered. Out of fear of the German army patrols, they do not dare to leave the forest, even as the food supplies run low.

Two young building workers are more interested in girls than their work; complications ensue at home.

After World War II, scores of refugees leave in search of a new home. They now stand in the hall of a large mansion, waiting to receive their deeds of ownership for sections of land that the lord of the manor had left behind after he fled. Among them is young Jeruscheit who, during her travels, had to bury one of her own children. Her husband has been declared missing, and up until now she has had little purpose in life. But then she discovers it: to work, to build, and to help others. And maybe someday Jeruscheit will find her family.

Dr. Gerd Thiessen, an experienced veterinarian, takes up a new job at a publicly owned manor. His research colleagues are less than thrilled about his ideas and modification proposals. Thus, the pretty and confident veterinarian Sabine Ladenbach becomes his only ally and soon they fall in love with each other. When Thiessen’s wife Eva notices that her husband is growing away from her, she starts to fight for him. Eventually, Thiessen realizes that Eva is the woman of his life, both privately and professionally. At the same time, he figures out that he needs the support of his team to achieve success in his field.

A farmer who has fled the republic returns disappointed from the West to the village of Oslitz (GDR). He and his wife are supposed to get their house and farm back, but the case becomes the occasion for an unusual LPG meeting. The chairman, a comrade from the town and the farmers want to find out what caused the returnee to flee and whether it could have been avoided. The farmer claims that the chairman wanted to force him into the LPG because of illegal fertilizer purchases. He interprets his behavior differently. In order to clarify the matter and learn lessons from it, those present re-enact the events before the escape with reversed roles.