On a winter night in the first year of Changshou, a Persian merchant mysteriously dies at the Yuelai Inn on the outskirts of Luoyang. Li Xiaotian is ordered to investigate, but finds no clues.
At the same time, more than a hundred members of a Tibetan peace delegation are found dead without a sound at a relay station northwest of Luoyang. War clouds gather along the border between the two nations. To prevent them from plunging into war again and causing widespread suffering, the Empress orders the Divine Tribunal to solve the case as quickly as possible.
After investigating, Li Xiaotian discovers that the deaths of the Tibetan delegation and the Persian merchant at the inn happened in exactly the same way.
As the descendant of a criminal, Li Xiaotian has no choice but to take on this earth-shattering case, for the sake of his family and his own future. He must follow every thread, clear away the layers of mystery, find the real culprit, and atone for his family's crimes.
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