Günter has completed his electrical engineering degree and returns to Berlin. His old foreman and his wife welcome him and want to take a Sunday trip to Grünau, but he wants to visit a mechanical engineering exhibition that is only open that day. The old gentlemen accompany him to Stalinallee, and here something fateful happens: Günter meets the girl he has always fancied again ...

In the mid-1950s, mayor Zwischenzahl is killed on the day of his inauguration in a West German town. The killer is Ruth Bodenheim, a Jewish woman, who wanted to avenge the death of her parents. Zwischenzahl, a former SA member, was apparently involved in the deportation of her parents to a concentration camp during the war. Ruth cannot bear the horrible events and the death of her parents and wants to open the eyes of the town′s residents.