Elderly sisters Lizzie and May live quiet, ordered lives in the house in which they were born; their self-imposed seclusion and the unchanging predictability of their lives shielding them from the changing world beyond. But the day comes when this protective isolation is broken; the world outside forces its way in. A stranger appears, unsettling them, bringing with him the threat of danger, upheaval and violence. Fearful and alone, with all semblance of comforting routine wrenched from them, Lizzie and May are driven to desperation. Dark memories emerge from their buried past as the sisters gradually slip from reason into their own confused realities, within which even their former carefully regulated world seems only a distant memory.