The world has fallen under a Zombie Apocalypse. Humans are now the minority. It no longer matters where you're from, your sex, or the color of your skin. It's every man for themselves.
So people have formed groups under the belief of strength in numbers. Remember however, not all groups are open to new arrivals.
Rumor is, there is one person who knows how to stop it. How to turn everything back the way it was. We all know how rumors tend to be though. The rest of us are just trying to survive.
The site takes place at the beginning of Season 3. It is several months after the group escaped the farm, and Lori is in the final days of her pregnancy. Rick Grimes and his crew have just found the prison. They have just Pulled up to the gates.