Sandrine Salome flees New York for her grandmother's Paris mansion to escape her dangerous husband, but what she finds there is even more menacing. The house, famous for its lavish art collection and elegant salons, is mysteriously closed up. Although her grandmother insists it's dangerous for Sandrine to visit, she defies her and meets Julien Duplessi, a mesmerizing young architect. Together they explore the hidden night world of Paris, the forbidden occult underground and Sandrine's deepest desires.