Rolf Köster has been working as a cashier in a small bank branch for years. Every day passes like the day before. He has a thirteen-year-old daughter who would rather write in a diary than speak and a six-year-old son who has to wear a bicycle helmet because he is constantly banging his head against walls. His wife organizes the whole family life, and Rolf stays in the background. But he has doubts as to whether he, who has "everything", is really happy. Then Rolf is unexpectedly given a week's vacation. He decides not to tell his family and to leave the house as usual. Rolf Köster begins to lead a double life.

The harmless Berlin taxi driver Herbert Boeckmann has a bad day: Three mysterious gentlemen put the corpse of Boris Stravinsky, a Russian economist, into the car. Unsuspecting Herbert brings the "passenger" to East Berlin. There Boeckmann falls into the clutches of the KGB, who considers him a top agent of the CIA. As Herbert eventually returns to the western part of the city, the CIA waiting for him to be the taxi driver again suspected of being a top agent of the KGB. To prove his innocence, Herbert must find the real killer of Stravinsky. Herbert is given mysterious vials to which he sniffs in extreme situations, helping them not only to amazing powers and unsuspected abilities. As Super Agent "Herbie Melbourne" mixed Herbert on the agent scene. But between the lines he gets in the line of professional killer.