Set three years after Dragon Inn, innkeeper Jade has disappeared and a new inn has risen from the ashes - one that's staffed by marauders masquerading as law-abiding citizens, who hope to unearth the fabled lost city buried in the desert.
Tianya and his sister are ordered by General Feng Peichuan to embark on a treasure hunt to find the Golden Moon Gem to cure the plague in Heishui Town, but General Feng Peichuan has other motives for finding this treasure.
In Empress Wu's reign, there are several bizarre deaths in the capital city of Chang'an. The rumors of the Martyrs Shrine's "Flying Goddess Mural" murder case are getting worse. Di Renjie is ordered to investigate the case. He cracks the mystery of the mural based on the characteristics of the Flower Sermon, which leads to the murderer, Li Luoyu. Soon after, Li Luoyu commits suicide. After multiple investigations, Di finally finds out the true murderer.