A global sensation is on the horizon: Scientist Paul Radmann seems to have found the magic formula for saving gasoline and thus increasing profits for the Düsseldorf-based company Denkal Industries. Shortly after presenting his research findings, however, Radmann is critically injured in a mysterious car accident in the Höseler Forest. In a large-scale rescue operation, the local fire department manages to free the researcher from the wreckage. But why is another person unconscious near the damaged Mercedes? It is Wolfgang Waldmüller, who shortly thereafter appears in the intensive care unit of the Ratingen Marien Hospital just as an assassination attempt on Radmann is carried out there. And what role does the Tunisian Hassan, a former classmate of Waldmüller, play? Chief Inspector Jansen from the Düsseldorf homicide squad is on the case.