1973. A final, top-secret mission to the Moon. Three astronauts in a tiny module, a quarter of a million miles from home. A quarter of a million miles from help. As Russian and American crews sprint for a secret bounty hidden away on the lunar surface, old rivalries blossom and the political stakes are stretched to breaking point back on Earth. Houston flight controller Kazimieras "Kaz" Zemeckis must do all he can to keep the NASA crew together, while staying one step ahead of his Soviet rivals. But not everyone on board Apollo 18 is quite who they appear to be.