In the Stone Age, Cang’s Flint Tribe had lived for generations on the edge of the Cangmang Mountains. Recently, hunting parties had repeatedly gone missing at dusk. Those who returned were either mute and deranged or covered in sores, soon to die. Every full moon, the abandoned ruins west of the tribe rang with the sound of bone whistles, while the totem patterns carved into the rock walls quietly shifted at night. Cang discovers that black moss remains at the campsites of the missing, and that the “taboo beneath the earth,” which the elders refuse to discuss, seems closely connected to the deep caves below the ruins. There are no supernatural powers, only the struggle for survival in a primitive tribe and the terror of the unknown. Every step of the investigation comes with a test of life and death, as an ancient secret gradually takes shape amid blood and mist.
