The end of World War II means the beginning of the Cold War. Former allies US and USSR have fallen out, and as a consequence, Germany is divided into two different states: West Germany, a federal republic and democracy, occupied by the US, UK and France. And East Germany, a socialist state with a one party system, occupied by the USSR. The border runs right through the heart of the country, dividing friends and families. East Germany surrounds itself by a fence, and in 1961, the Berlin Wall is erected, cutting off the last means of escape. The opposing systems watch each other with mistrust, and heavily arm themselves with high end weapons. And they spy on each other as best they can. This West German TV series is based on real cases of German-German espionage of the time. There is no regular cast, although a lot of actors appear in several episodes, taking on different roles. Each story is told differently and set in different locations, depending on the plot.