Post-apocalyptic America is a 10th kingdom, thus far unknown to the inhabitants of the other nine kingdoms. The courier (or LW, if you so choose) and their gang are dragged into trouble when a prince from one of the kingdoms is turned into a dog and escapes into the 10th.
For more info on the TV series, click here (http://en.wikipedia.org/wiki/The_10th_Kingdom), potential A!As.