from the back of the book:
A young Don Juan is found murdered in front of his apartment building early one morning, and an elderly couple is reported missing after an excursion to the ancient site of Tindari - two seemingly unrelated cases for Inspector Montalbano to solve amid the daily complications of life at Vigata police headquarters. But when Montalbano discovers that the couple and the murdered young man lived in the same building, his investigation stumbles onto Sicily's brutal "New Mafia," which leads him down a path more evil and far-reaching than any he has been on before.
This book was short-listed for the Duncan Lawrie International Dagger award, an award I don't remember hearing of before. It is "given by the Crime Writers' Association for best translated crime novel of the year".