The woodcut-esque front cover is really cool, as is the interior art. Great setup, and the competing factions will be fun for the PCs to interact with--especially as they try to figure out what's going on here. (Which group is "right"? That will be difficult for the PCs to determine without some investigations.) The encounters perfectly reinforce all this. I imagine that the first time a group sees a burning wicker giant from afar, some frantic decisions will be made.