Averi, overwhelmed with anticipation and fueled by a potent mix of methamphetamine and sadistic glee, flings open the door to reveal her naked, sweat-slick body to her boyfriend's stunned mother and twin sisters, eagerly inviting them into a sordid tableau where she and her partner, Nate, intend to subject them to a night of depraved sexual domination that threatens to irrevocably unravel the family's bonds.