Naples, a city of a thousand shades, sees emerge from its dark streets a series of ruthless murders, perpetrated with a modus operandi so cruel as to cast despair upon the local police officers. Commissioner Scapece, a determined man but frustrated by the apparent lack of connections between the victims, finds himself facing an enigma that seems to elude his understanding.

With the increasing difficulty of the case, Scapece decides to turn to his old friend and colleague, the renowned Commissioner Casu. With his keenness and unmatched intuition, Casu will soon prove instrumental in unraveling the mystery shrouding the city.

In the heart of Naples, amidst its winding alleys and vibrant rhythms, there also lies a disturbing prison, ruled by an unscrupulous director who keeps the inmates under his control with iron authority. As Scapece and Casu delve into the shadows of Naples, battling against time and the dark forces threatening the city, their blend of intuition and luck will guide them towards uncovering the truth hidden behind the murders.

With courage and determination, the two commissioners will act in unison to put an end to the murderous rampage of the serial killer and finally deliver him to justice, bringing light where once only dark shadows reigned. .