Heinz Erhardt wanders through the Black Forest as a photographer for a magazine. On the train he meets a young girl who from now on does not leave his side.
A series of knife murders have an odd feature about them; the victims find that their luggage has been packed for them just before their deaths. Scotland Yard investigates, and discover that the murders are linked to an addictive drug called Mescadrine.
The enterprising Anton Klapproth runs a flying duck farm in the Eifel, but now he finally wants to experience a real adventure in the big city of Cologne. A visit to a sanatorium for the mentally ill seems particularly sensational to him, as there is certainly a lot going on there with the "Jecken"...
