Chinese Spies: From Chairman Mao to Xi Jinping by Roger Faligot
Incredible book about the secret world of Chinese spies. The author has been researching the secret security service in China for decades and the depth of his knowledge is on display in this novel.
I am well versed in the history of China, but it's really interesting to hear about the history behind the history. For example, there is a chapter on Tiananmen Square where he describes the discussions and role of the security service behind the scenes and everything that led to the decision to attack the students.