When the name of an author enters not only in the history of literature but even becomes synonymous with a common word, then it is clear that we are talking about a character of truly exceptional importance. The merit (or demerit) of De Sade was that of having highlighted the darkest and most unacknowledged part of the human soul. The Marquis de Sade was the author of novels characterized by a cruel and shocking eroticism for his time, it is no coincidence that the term "sadism" was initially used in psychiatry and only later became commonplace. The story of the Marquis de Sade, however, is not simply the story of a monstrous and obscene literary construction, but it is also the story of a man who lived an extraordinary life, then personally paying a very high price for his choices and for his unbridled passions. With his usual dry and essential Esther Neumann tells the incredible human parable of Sade highlighting the profound originality of the thought of the boudoir philosopher, a man who had the courage and boldness to go beyond every limit and every moral law.