The Klemmers and the Neuberts live in a two-family house. The day before their driving test, Egon Klemmer and Bruno Neubert secretly buy a small blue Saporoshez from Ms. Stepper. Buying a car triggers turbulent entanglements, primarily due to Egon, who uses the little blue man for a secret jaunt.
At the end of the 1950s, the production of optics in the German Democratic Republic has reached top quality and instigates interest in the West. When national demand rises strongly and at the same time the export to South America heavily decreases, the Volkspolizei - the GDR police force - starts to look into the case. Two seemingly unrelated cases are the starting point for the investigation by second lieutenant Schellenberg of the department for optics racketeering: An old woman who was arrested in the Berlin city railway for trying to smuggle a pair of binoculars to West Berlin, and a dead person in an area of allotments who was involved in obscure dealings with optical devices.
