When Gary dares his girlfriend Juliette to don a black wig and masquerade as her non-existent twin sister to a party, neither of them could have imagined the torrid encounters that were soon to follow. As Christine, Juliette can follow her fantasies to whatever lengths, and her lust for everything sexual can be fulfilled whenever she desires. But Christine begins to take over, destroying Juliette's relationships and dragging her deeper and deeper into a world where sex, and sex alone is the only thing that matters. Christine is no longer just a black wig and a dress in a closet, she's real and she wants to stay. One of the sisters has to go. But who will survive in this battle of persona's. Will it be the quiet and reserved Juliette, or the sexually avaricious Christine?