Forgotten from human history is Kowloon, the most densely packed subterranean megalopolis known to man. When the Emperor's nephew finally slays Jian, a former general turned traitor, the fallout is catastrophic and far-reaching, stretching from the chaotic streets of South Kowloon to the summit of Yu Tower, the heart of the Yaozhi Dynasty. Meanwhile, Kowloon's walls begin to crumble as for the first time in their ancient history, the surface has uncovered their existence.