Celestia has a secret. There is a voice in her head. It plays a game she doesn't really understand but fears all the same. It wants her, and with everypony that knows of its existence its power grows. She has kept it away for as long as she can remember.

Luna is set to return, and with it, a friend of the voice. Can Celestia endure the voice's games and strengthen her relationship with Luna, or will she lose everything to it?