A case-solving notebook written by the Lu family. From the machinations of Kangxi to the confusion of the Republic of China, the dark rules of survival inherited by the Lu family. The corruption case in the Yellow River, the murder case of the rich police, and the theft of 100,000 yuan in the Republic of China. Behind every case is not only the truth, but also conspiracy and calculation. The Lu family are good at calculations, tactics, and have an insight into human nature. It is impossible to calculate the fate of family and country. What is recorded in the notes is survival or the truth.