Sam Bell is nearing the end of his three year contract with Lunar. His home has been a moon base where he has spent his days alone, mining Helium-3, a precious gas that holds the key to reversing the Earth's current energy crisis. Isolated, determined, and steadfast, Sam has followed the rulebook obediently, and his time on the moon has been enlightening, but uneventful. He does his job mechanically and spends most of his available time dreaming of his imminent return to Earth, to his wife, young daughter and an early retirement. But two weeks before he is due to depart, Sam awakens from a freak accident and discovers that Lunar have their own plans for replacing him and that his replacement is eerily familiar. Before he can return to Earth, Sam has to confront himself and the discovery that the life he has created may not be his own. It's more than his contract that is set to expire.