The SOKO Köln investigates the cathedral city with humor and often with hard work. Their cases take them into a variety of environments, from the Cologne clique to the terraced housing estates on the outskirts of the city.

One of the most spectacular and renowned conductors of the 1930s, Wilhelm Furtwangler's reputation rivaled that of Toscanini's. After the war, he was investigated as part of the Allies' de-Nazification programme. In the bombed-out Berlin of the immediate post-war period, the Allies slowly bring law and order to bear on an occupied Germany. An American major is given the Furtwangler file, and is told to find everything he can and to prosecute the man ruthlessly. Tough and hard-nosed, Major Steve Arnold sets out to investigate a world of which he knows nothing.