On a winter night on a remote Nebraska road, 27-year-old Mark Schluter flips his truck in a near-fatal accident. His older sister Karin, his only near kin, returns reluctantly to their hometown to nurse Mark back from a traumatic head injury. But when he emerges from a protracted coma, Mark believes that this woman – who looks, acts, and sounds just like his sister – is really an identical impostor. Shattered by her brother’s refusal to recognize her, Karin contacts the cognitive neurologist Ger...