Inspector Lorenzo Fabbri attends a concert by pianist Flavio Bonomi, who has agreed to receive him afterwards. But when his cousin Antonio accompanies Fabbri to Flavio's dressing room, they hear a scream and find the pianist slain in his dressing room, where an MP3-player is playing.

The murder of night club singer Daria demands special commitment from Inspector Fabbri, as she was a close friend of Fabbri's on-off girlfriend Katia Martelli, a forensic expert and part-time singer.