Ancient enemies stalk ghostly fog forests as legends come to life. The Divide is flooded. Habryn Kail and the Homunculus are missing, presumed dead. Sal and his companions seek the source of the flood in the legendary Hanging Mountains, hoping to head off a crisis that was put in motion a thousand years ago. As conflict erupts between two long-forgotten civilizations, the outsiders find that allies are hard to come by. Taken captive and separated, they uncover uncomfortable truths about the world and how it relates to the one that came before--our world. Something dark and deadly is stirring in the heart of the mountains. And the closer it comes to waking, the more certain it seems the Homunculus may not have been the enemy at all.