A book about a coup d'état 10 years ago is related to the CCP’s ongoing factional war

Ten years ago, in March 2012, there was an armed coup d'état in Beijing. It failed and laid the groundwork for a decade-long brutal factional war within Zhongnanhai, the Chinese leadership compound. Recently, a new book, "China duel", revealed details behind the coup while raising more questions about the timing and purpose of the book. Who is the author? What was revealed in the book, and how is it related to the CCP power struggle?