In the waters of the Cagnan Grando, a waterway that cuts through Treviso, the body of notary Picello is found. The murder is compounded by a robbery at a clothing store, wrongly attributed to a clochard, who soon turns out to be a reliable witness in the investigation. The investigation will become complicated. The pasts of two of the protagonists are full of shadows that hide poorly concealed secrets and will lead to the discovery of the motive for the heinous murder. "Marshal Occhipinti" is a series of tales of the investigations of the Sicilian carabiniere transplanted to the land of Treviso and supported in his investigations by his trusted friend, innkeeper and runner Mario.