After winning her mother's freedom from the Celestial Emperor, Xingyin thrives in the enchanting tranquility of her home. But her fragile peace is threatened by the discovery of a strange magic on the moon and the unsettling changes in the Celestial Kingdom as the emperor tightens his grip on power. While Xingyin is determined to keep clear of the rising danger, the discovery of a shocking truth spurs her into a perilous confrontation.