When zombies overrun downtown Chicago during rush hour, a small group of survivors find themselves trapped underground on an El train into the city. As the dead begin to overwhelm the living, these survivors must learn to stay alive in a world filled with the hungry dead. As the hours turn into days and the hope of rescue fades, what will those few who remain do to stay alive?

A group of normal men and women find themselves in zombie infested Chicago with only their wits and the things they can find laying around them. How long can they survive as the world around them slowly dies… and tries to eat them?