Will and Eden were once a loving couple with a beautiful child. After a tragedy took their son from them, Eden disappeared suddenly, leaving her grieving husband behind. Three years later, she has returned with a new husband out of the blue and as a profoundly and eerily different person. On a dark night in the Hollywood Hills, Will returns to the house in which they lived for a reunion with Eden, his new girlfriend, Kira, and the group of friends that fell apart in the wake of the tragedy. Over the course of the evening, Will is gripped by mounting evidence that something very insidious has taken hold of his ex-wife, and that the new people in her life have a mysterious and horrifying agenda. But can we trust Will's hold on reality? Or will he be the unwitting catalyst of the doom?