The film tells the story of the smelter brigade of a steel mill whose members are connected by a strong comradeship. Among the workers are, for instance, young Rolf, whom everybody just calls "Lachtaube" and who always comes through for his co-workers, or the likable Hubert, who works as a simple smelter again after being dismissed as the head of the steel mill. Then, there is also the stubborn Manfred, who should have become a brigadier long ago because of his experience and his competence, but this privilege is refused to him because Manfred is not a party member. Ironically, it is Manfred who hears by accident about the plans of the mill to close down the old Martin furnaces – and to lay off the smelters. When the other men learn about the plans they enter the barricades for their jobs and force the plant′s management to face the workers′ demands and criticism.

A conference is to be held once again to discuss the construction of a new dam, which Professor Paul Satie rejects. During a train journey, he spontaneously leaves the train. Here in Wolfsgrün, from 1948 to 1950, he helped build the old, now far too small dam as a youth brigadier. He and the others who helped build it have erected a monument to this. A monument with his name on it. Is that perhaps why he is against the new dam?

After his family moves from Potsdam to East Berlin, 15-year-old Klaus initially has difficulties at his new school, especially with the popular Heinz. With the help of class teacher Magnus, Klaus and Heinz settle their differences and become friends. When Magnus dies unexpectedly, his class is taken over by young Anne Morgenstern. Klaus and other classmates manage to overcome their initial dislike of the young teacher, but Heinz remains steadfast in his rejection and tries to force her replacement.