It is the near future. Astronaut Sam Bell (Sam Rockwell) is living on the far side of the moon, completing a three-year contract with Lunar Industries to mine Earths primary source of energy, Helium-3. It is a lonely job, made harder by a broken satellite that allows no live communications home. Taped messages are all Sam can send and receive. Thankfully, his time on the moon is nearly over, and Sam will be reunited with his wife, Tess, and their three-year-old daughter, Eve, in only a few short weeks. Finally, he will leave the isolation of Sarang, the moon base that has been his home for so long, and he will finally have someone to talk to beyond Gerty, the bases well-intentioned, but rather uncomplicated computer. Suddenly, Sams health starts to deteriorate. Painful headaches, hallucinations and a lack of focus lead to an almost fatal accident on a routine drive on the moon. While recuperating back at the base (with no memory of how he got there), Sam realises Lunar Industries may not have his best interests at heart, especially when he meets his replacement