How Can One Cross the Nine Heavens?

In an era when humans and demons live together in peace, bizarre cases plague the Nine Heavens. Merfolk tears, a serpent carrying a soul in its mouth, an ancient Boyi mirror, fragrant resentful bones... The human princess Mu Qingwu establishes the Nine Heavens Bureau. Alongside Yan Ci, a formidable martial artist; Lu Guanzhi, a steadfast champion of justice; and Guan Yao, a gifted physician, she travels across the Nine Heavens to investigate cases involving both humans and demons. Under the rule of justice, righteousness never dies. The four face one strange case after another and repeatedly find themselves in peril, all to preserve the hard-won peace of the Nine Heavens.