Richard Brock, the ingenious interrogator of the Vienna police, is contacted by Stefan Merz, a high-ranking official of the Ministry of Interior. The venerable friend enlists Brock's help to solve a delicate case: Karin Kimminger, an employee of the multinational construction company SANDAG, was murdered. Her sister Maria observed the alleged perpetrator when leaving the apartment, but she could not recognize his face (thetvdb.com)