Michela Licalzi is beautiful, married, has a lover and is found dead, naked, suffocated in her home. The investigations initially entrusted to Commissioner Montalbano are then removed and entrusted to Panzacchi. Everything suggests that the murderer is Maurizio Di Blasi who is then killed by Panzacchi's men. But when it gets in the way, the Montalbano mafia begins to investigate unofficially again. And the solution to the crime will come unexpectedly from the concert performer Cataldo Barbera and his violin, or rather from the voice of the violin that plays.