In the future "new era" of highly digitized cities, Lu Yuan was once the core architect of the "Tianshu Intelligent Core". He personally built the "neuron network" on which the city depends, but chose to retire due to concerns about data ethics. However, a series of bizarre cases - from the "data suicide" of a rising political star to the mysterious disappearance of old friends - draws him into the whirlpool again. He discovered that the "Tianshu Intellectual Core" he was once proud of had become a huge network, tightly knitting together the ambitions of business empires, the games of political factions, the crimes of underground gangs, and the fragility of legal justice. Lu Yuan must join forces with the iron-fisted prosecutor Shen Qingqiu to fight against Gu Changfeng, the ruthless CEO of Tianshu Intelligent Core, and Ye Xiao, the leader of the "undercurrent" gang hidden deep in the data. In this game about the fate of the city, data is both a weapon and the key to the truth, and Lu Yuan will become the only hope to uncover the "Shadow of Tianshu".