The truth behind the deaths of all forty-nine members of an opera troupe twenty years ago, and the curse of ghost soldiers marching through the mortal realm once every hundred years, both stem from a pact that demands one of a pair of twins die on the Ghost Festival. When Chen Qingsui lifts the bronze mirror in the ancestral hall, it reflects Lu Li's rotting back. The festering Taiji tattoos there fit together with her newly appeared birthmark to form a complete pact with the Nuo god.
