1. The loyal sword trusted by Chiang Kai-shek and the "Himmler of China" that made Roosevelt curious are the most mysterious figures in the modern history of China. Why did he choose a broker as his lifelong career? How did he become the "king of agents" of the Kuomintang? Known by the Kuomintang as "the father of China's intelligence work". He founded the Military Bureau, an important intelligence agency of the Kuomintang, and was called "the world's first spy" by American intelligence agencies. Chiang Kai-shek said: "Comrade Dai will not die, and we will not quit Taiwan today!" Zhou Enlai said: "With Dai Li dead, the party's revolution can be successful ten years ahead of schedule." As "the most mysterious figure in China's modern history", Dai Li's life was full of mystery, and even his death was A City by the Sea.

2. To study the history of the Kuomintang, it is necessary to study the history of its spy agencies, and Dai Li, as the leader of the Military Bureau, one of the two major spy agencies of the Kuomintang, has a position, role and influence in the history of Kuomintang spies that cannot be ignored. Therefore, studying Dai Li's personal history is a very important content to understand the history of the activities of the Kuomintang spy organization.

3. This book is the first attempt to rewrite Dai Li in the form of special research, starting from a section. Through the detailed research and analysis of Dai Li's family background, growth, schooling, starting a business, making friends, spy experience, personality hobbies, his relationship with Chiang Kai-shek, his cooperation with the United States and even the causes of his sudden death, this paper comprehensively describes and shows this "lean generation" and provides readers with another new perspective to understand Dai Li.

4. The author Ma Zhen Du, a research librarian of the Second Historical Archives of China in Nanjing, is currently the vice president of China Modern Historical Materials Society. The main research directions are the history of the national party, the history of Kuomintang spy activities and the history of War of Resistance against Japanese Aggression.