Fans adored Prima Flavia Petrelli and admired her divine voice. But most of all, Flavia was loved by someone who became her nightmare. After each concert, a secret admirer filled the prima's dressing room with bouquets of yellow roses. He stole her gloves and other ladies' little things... Fan obsession grew into mania. The attack on the young singer Francesca, close to the prima, was the first warning of danger. Detective Guido Brunetti, an old acquaintance of the prima, decides to help her. He is sure that he can easily spot the crazed fan...