You could read this as standalone and I doubt that the order in which you read the books would make a ''lot'' of difference to your enjoyment of the series, but why not give yourself a treat and start back at the [[The Shape of Water by Andrea Camilleri|beginning]]?
{{amazontext|amazon=14472033131447203321}} {{waterstonestextamazonUStext|waterstonesamazon=9153927B009WSCV1W}} [[Andrea Camilleri's Inspector Montalbano Books in Chronological Order]]