It has been about a month since the outbreak began. All across the United States, possibly across the world, a virus has been killing people rapidly. But they don't stay dead. No, they come back, and they hunt the living. Slow, yes, but they travel in herds, ripping apart and devouring those who were able to survive the initial outbreak. Mostly everyone was dead, by the time that the government was even close to discovering what this virus is. Nobody knows, and nobody has any ideas how to find out what the virus came from. 

We are a group of survivors, in the city of Pittsburgh, Pennsylvania. However, we are not together yet. Our city was overrun and we all stayed in hiding. Whether it was on a rooftop, or underneath the sewers of the city, we all stayed safe, while everyone else in the city died from this abhorred disease, turning people to eat each other. A month later, it is now time to come out of our hiding places. Supplies have run low, and everyone is now in need of water, and food. Search quarantine zones around the city; raid abandoned grocery stores. Kill other survivors? How will you survive?