well now that I have a few people, I want to toss around the idea I had a little bit.

There was a Quarantine Zone in the city. A big one, with electronically locking, barbed wire gates, that surround a large portion of the central city of Seattle. Someone has lost their mind completely, and has found the controls that lock the gates and do pretty much everything inside of the zone. Their clever ruse? Luring survivors into the area and locking them in, facing them with all the undead inside the gates. There are little supply drops that will help the survivors now and again, but also trials to try and kill them quicker.

This is the general idea. Of course, if you would all prefer, we can start before we go into the gated area, so that we can build up characters before we go in.