The decapitated body of a thirteen-year-old girl turns up at a coastal location in Mar Menor. Not far from the place, the Police finds a sleeping young man wearing a bloody t-shirt and displaying clear signs of alcoholic intoxication. The solution of the case seems so evident, that the Captain of the precinct where the events occur, assigns it to a rooky inspector thinking that this would be a good way to get the new cop's feet wet in investigative procedure. Chief De la Mata expects the case to be closed promptly.
That is how, from one day to the next, Juanito Proaza finds himself partnering veteran policeman Paco Garrido, who likes to use unorthodox methods, and working closely with Doctor Luzon, a brilliant pathologist and a great master at presenting his findings with great dramatic flair. Juanito heads an investigation that gets complicated by the minute and eventually results in the uncovering of a sordid net with multiple tentacles, among these a mysterious literary society dedicated to paying cult to angels.