Deep within a stark mountain region stands the Abbey of Saint-Wandrille-des-Profondeurs, a gray stone fortress that combines a cloister for austere novices, a disciplinary penitentiary, and, hidden within its foundations, crypts dedicated to an ancient occult cult. Outwardly, the monastery is a model of piety, silence, and mortification. Inwardly, it is riddled with the hypocrisy, frustration, and repressed deviances of its leaders.

It is within this stifling confines that a young, amnesiac novice, possessed of an androgynous and magnetic beauty, is taken in. No one suspects that he is in fact Asmodeus, the Prince of Hell, master of lust and wrath, come to walk incognito among mortals.

Beneath his deceptive appearance of fragility, the demon exerts an irresistible, toxic fascination. Week after week, the pillars of the abbey—the Mother Abbess Hildegarde, consumed by lust and tyranny, and the sadistic and authoritarian Father Superior Malachi—descend into obsession. Vows of chastity are broken, cells become the stage for perverse confessions, and the line between divine punishment and carnal submission collapses.

As Asmodeus's fury and lust spread through the corridors, the entire monastery drifts toward an abyss of decadence, transforming the sanctuary into a gigantic witches' sabbath where the blinded monks beg their unknown master to damn them for eternity.