A woman is found dead on a rocky ledge above the sea on the island of Capri. Maria Grifo was the director of the famous Naples Conservatory of Music. Could the murder have had something to do with the disappearance of the one-of-a-kind Stradivarius harp from the music school? Its sound – as investigators Enrico Rizzi and Antonia Cirillo discover – is so beautiful there are people who would kill for it.