Young entrepreneurs Sean (Emile Hirsch) and Ben (Max Minghella) meet stranded travelers Natalie (Olivia Thirlby) and Anne (Rachael Taylor) at a hot Moscow nightclub. Their whole world changes in an instant when an alien attack devastates the city and everything goes dark. Joined by a Swedish businessman (Joel Kinnaman), the youths emerge from hiding days later and must somehow fight back against a nearly invisible enemy that could find and disintegrate them at any moment.