This type of books, in its various expressions (detective, legal thriller, noir etc.), are in the most loved literary genre by readers. He develops a precise narrative program: from the discovery of a state of guilt, a crime committed, we move on to the search for the causes, the removal of false clues and, finally, the identification of the culprit. The detective novel is easy to read: it has a captivating beginning, a central plot and a final solver. The difficulty of writing a crime novel or noir is to manage the story with logic and inventiveness, without taking away the taste of suspense and leaving nothing to chance: each element must be rigidly under control, so that nothing remains outstanding or unexplained.