Detective Montalbano (Luca Zingaretti) investigates the murder of a local businessman called Lapecora in this story which has been adapted from the best selling books by Andrea Camilleri.

As Vigata celebrates St George's Day, an elderly man, born locally, returns to Sicily after having lived in America for many years. On the same day a diary dating from WWII is discovered hidden in an old bunker.

It's high summer in Vigata and the murdered body of a young woman, Agata Cosentino, is found in the municipal archives where she worked. But the building was supposed to be closed for the holidays, so what was Agata doing there?