Born at the same time on the same day in the same hospital, Pig and Runt have been inseparable ever since. They speak in their own language, play by their own rules, and create a world for themselves in which boundaries blur between truth and illusion.
But with the approach of their seventeenth year, and accompanying sexual awakenings and dawning awareness of love, and different kinds of love, Runt begins to wonder what might lie outside the world they have constructed for themselves and to yearn for her own individuality apart from Pig.
This night is going to be different from others - the inseparable are about to separate and which one will survive depends on which one can break free.