The ambitious queen colludes with the imperial master to send killers to destroy the clan of incense makers and seize the incense blood inkstones, thus creating an unjust case inside and outside the palace ten years ago. Ten years later, female detective Luo Xian, incense maker An Ying, and Yin Nan, Xiao Ling, and Qifeng, each with their own unique skills and mysteries of their origins, investigate the truth.
