Well, you can read the OOC and IC if you want to, but it's basically a fantasy world (elves, dwarves, etc) crossed with steampunk (whale oil to run things and medium technolgy and such) and the entire world has been covered in sand for some inexplicable reason. So that adds a flavor of post-apocalpytic. The players play a group which in that world are known as Dwellers. A special team that is tasked to scavenge the remains of once great cities for whatever they can find to sustain the Tribe.
That is basically the gist of it. As you can read, they finally arrived in the city and are now open to... well, scavenge and run into trouble.