Zhenya, timid and shy homebody, ended up locked inside an ordinary nine-story apartment building. A sturdy steel door, no keys, no tools in the apartment to break it, no one to come to his aid—outside the window, an apocalypse is unfolding: people go mad, become dangerous and aggressive creatures that hunt someone like him. Step by step, with cunning and ruthless cruelty, Zhenya carves out his life-space around him, and he doesn’t notice that he himself is becoming a monster for the monsters.