Sam’s contract comes to an end: it has spent three years on the Moon, watching for the automated station on extraction of rare gas. Three long years in full loneliness, short of speaking robot GERTI, can change any. For two weeks before returning to the earth Sam meets the relief – the person as like as two peas similar to it. Perhaps it is hallucination? Or a fruit of its sick imagination? Perhaps something happens on the Earth, and video-messages from the house, all these years supporting Sam, lie?