A decade ago, the Kingdom of Night began the war against the Kingdom of Rivers, ravaging the lands and releasing mó—beautiful, ravenous demons—to roam free, drinking the souls of mortals. Now the mó have made it beyond the magical wards of the immortal realm—the Kingdom of Sky—and will not stop until the entire world falls to darkness.

An’ying is determined to banish the mó to their realm and return the mortal realm to peace. But a stunning betrayal has turned the tides of this war: Her handsome rival from the Immortality Trials and the man she was falling in love with, Yu’chén, is now the enemy. Yu’chén is half mó, his mother none other than Sansiran, the Demon Queen of the Kingdom of Night . . . and the monster responsible for killing An’ying’s father.

There is one hope for the future, though. The boy in the jade—An’ying’s lifelong mystery guardian and heir to the last mortal Emperor—Hao’yáng. An’ying and Hao’yáng must join forces to rally an army that stretches across realms, from the Four Seas of the Dragons to the Phoenixes of the Golden Desert. But first, An’ying must awaken to the immortal power slumbering in her own veins.