In year 689 of the Tang Dynasty, Wu Zetian is to be crowned the first Empress in China despite opposition from Tang officials. She has a Buddha figure built overlooking her palace in Luoyang, but an official inspecting the progress mysteriously erupts into flames. Penal officer Pei Donglai and his superior investigate and interrogate the supervising builder, Shatuo, who was formerly imprisoned after he took part in a rebellion. They find nothing and Pei's superior dies soon after erupting into flames.