A unique document comes to light for the first time. Maurice Lever, after researching for over twenty years anything related to the Marquis de Sade in public archives and private collections, discovered a treasure trove of correspondence: a series of letters that confirm the passionate love affair of the author of "Justine" and "120 Days of Sodom" with the young and beautiful sister-in-law of Jean-Prospère de Plancy.

For the first time, the unmistakable image of the unattainable virgin is offered to de Sade, who will embody his most extreme sexual fantasies: incest, sacrilege, sin, debauchery. What is most astonishing is the passion with which the would-be nun plunges into this illicit relationship: by signing the letters in her blood, she symbolically denotes the measure of absolute sacrifice.

Maurice Lever unravels and comments on one of the darkest episodes in the tumultuous life of the Marquis de Sade. Furthermore, he presents, among other things, an unpublished series of letters between de Sade and his wife Renée Pélagie, which illuminate the myth of an unparalleled yet controversial personality.