Tension in Italian - the second case for Commissioner Marelli. A new case for Commissioner Marelli: A few days after a spectacular premiere, the German opera singer Anne-Marie Hofer, living in Rome, is found stabbed to death in her apartment. Suspicion quickly falls on her ex-boyfriend Fabio Pellegrino, who was seen at the crime scene. He vehemently denies the crime, but how can he prove his innocence without an alibi? What role does a fan of the star play? The police are in the dark for a long time until suddenly a lead takes them in an unexpected direction...