Paris, 1933. In the aftermath of her love triangle with novelist Henry Miller and his dancer wife June, thirty-year-old Anais Nin is left reeling. Stifled by her bourgeois marriage, she retreats into the midnight world of the Grand Guignol, the legendary theatre of horror and fear whose devoted patrons thrill at the macabre spectacles depicted on the black box stage. It is there that she falls under the spell of the actress Paula Maxa, known as The Maddest Woman of All Time, who awakens Anais to a secret realm of bewitchment and vice, of pleasure and pain. Only Maxa already belongs to Monsieur Guillard, the lustful night creature that haunts the dark streets of Pigalle. As the demon lover's insatiable hunger grows stronger by the hour, Anais finds herself trapped in a far more dangerous triangle, a cat-and-mouse game with Maxa's very soul as the ultimate prize.