A group of young people, having decided to celebrate their friend’s birthday in an exotic setting, went to an abandoned military bunker in the Moscow region. For some, this saved their lives when a monstrous epidemic covered Russia. Now those who survived will have to desperately try to survive in a new world inhabited by crazy bloodthirsty creatures. At first, people manage to unite in fortified settlements, but sooner or later they will have to face not only mutants, but also other people who are used to dictating their terms and talking to strangers through the sights of automatic weapons...