**"Nine Gates of Lead Marks"**
In the eighth year of Yongzheng's reign, a strange situation suddenly occurred in the capital. Zhao San, the widower of Shuntian Mansion, and Chen Mo, whose life experience is a mystery, are involved in a shocking mystery because of a green corpse carrying a "blood-coagulating secret edict". The dragon-patterned copper box hides the mystery of the silver lead core, the molten lead movable type in the belly of the charred corpse in the academy seeped out the poisonous ink of "Lu's Fragments", and the bead in front of the ice coffin in the moat actually reflected the nine-door defense map of the current dynasty...
The inscription of Nian Gengyao on the sword of guard Erhe at the sticky pole, the silk code of the Blood Altar of the Silkworm Temple, and the timing of the killings in the sound of the gears of the Western self-ringing clock all point to the "man in the bamboo hat" operating in the dark - this ghost who is proficient in the mechanisms of the Ming Dynasty and Western technology, actually turned the Forbidden City into a murderous machine of flesh and blood gears.
Deep in the Jingling Underground Palace, the last words of Kangxi recorded by the rammed earth microphone, and the secret edicts transcribed by Manchus and Han people bleeding behind the upright plaques will eventually reveal the truth that Yongzheng feared most: the lead poison corroded not only the bodies of the Eight Banners disciples, but also the iron law of "secret reserve" that has been running for hundreds of years under the dragon vein of the Qing Dynasty...
