2056 ­– Company employee Hannah and scientists Gavin and Dimitri are on board the Rubikon space station researching an algae project intended to provide humanity with a permanent supply of oxygen and food. But all of a sudden the earth beneath them disappears in a brown, toxic fog and all contact is broken off – are they the last survivors? Should they leave the safe station and risk their lives by flying back? What is worth living for? And what is worth dying for?