Silence, a professor of modern criminal investigation, accidentally traveled to the third year of Yonghui of Emperor Gaozong of the Tang Dynasty (AD 650) and became the chief secretary of Si Tiantai, a ninth-level official in Chang'an County who had just drowned and was ignored.
The first thing he faced when he woke up was his "drowning case". With meticulous on-site investigation, he concluded that he did not drown, but was murdered and dumped. In the process of avenging himself, he was inadvertently involved in a murder case of a Persian businessman that shocked both the government and the public.
The meticulous reasoning and scientific investigation techniques he displayed - scene reconstruction, trace evidence, blood stain morphological analysis, and time of death inference - attracted the attention of the equally thoughtful Prime Minister Di Renjie of Dali Temple. From then on, Shen Mo, a seemingly idle Sitiantai official, became Dee Gong's "non-staff consultant".
The story begins with the acquaintance and cooperation between Mo Mo and Di Renjie. Through the detection of a series of seemingly isolated cases - the Qujiang poisoning case, the faceless charred corpse case, and the Baqiao ghost case - it is gradually discovered that behind all the cases, there is a huge conspiracy spanning the Western Regions, Chang'an and Luoyang: the Byzantine espionage organization "Fu Fang" lurked in the Tang Dynasty for ten years, stealing intelligence, buying off officials, and destroying the Silk Road.
In the process of tracing the truth, Shen Mo met his mentor Li Chunfeng (the adoptive father of the original owner), the killer Kang He from the Western Regions, the old widower Wu San, the old man Lao Song from Yizhuang, and his colleague Zhang Chang. Some people die, some people leave, some people stay.
In the end, Shen Mo grew up from a time traveler who just wanted to survive to the first director of the "Chao Criminal Investigation Department" who protected the truth, and officially rooted the concept of modern criminal investigation in the Tang Dynasty.
