The Divide is flooded, at great cost of human and inhuman - life. Far from home, Sal, Shilly, and Skender seek the source of the deluge in the legendary Hanging Mountains, traveling in a magical ship of bone. New threats await them in the fog forests of the Panic, and new tests of their friendship. Caught in a conflict that erupts between two long-forgotten civilizations, they struggle to discern ally from foe, and to find trust when it is needed most.<BR>In their wake comes the Homunculus, vessel and prison of the Castillo twins - sole, strange survivors of the catastrophe that changed the world forever, a thousand years ago. Their mission is paramount, their urgency contagious. Something much darker and deadlier than the Swarm is stirring in the heart of the mountains.<BR>And for Habryn Kail, already assumed dead by his masters, it might really be the finish of him, this time.