After escaping the towering city of Aurora and fighting for the safety of Solstice--the secret sanctuary of the misunderstood Song Weavers--Ash has the battle of a lifetime ahead of him. A battle for freedom. But a battle is the last thing Ash wants now that he's finally come face to face with his long-lost mother. Though the two of them don't quite see eye to eye, they're up against a common enemy. They must defeat the Devourer: the largest, most ferocious Leviathan, known by local legend as the "World Eater" for the way it consumes anything and everything in its path. In a fight that will take the Pathfinders, yeti, Song Weavers, and even Leviathans all working together, it's up to Ash to get these warring factions on the same side. If Ash and his ragtag crew of friends aboard the Frostheart can't stop the Devourer, Ash's family reunion will be short-lived.