Two professors are dead - one at the University of Bonn, the other at St John's College in Oxford. Is it the same perpetrator in both cases? The investigators, Chief Detective Commissioner Krüger in Bonn and Detective Chief Inspector John Blackmore in Oxford, are at a loss. Is the solution to be found in a decades-old, still unsolved murder case on the Rhine? Tension-filled investigations, colorful characters, and witty dialogue - a successful crime debut.