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.

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.

1956 film by Martin Hellberg