Not nearly as in-depth due to time limits (and mostly focused on the Xi Jinping era) but Red Pen’s A Summary of Xi Jinping’s Governance of China can be a good primer! Really, in order to understand the PRC, you at least need to understand Mao, the Gang of Four, Deng Xiaoping, and Xi Jinping. There were other leaders, but these have perhaps had the largest impact on the PRC of today. Xi Jinping Thought upholds Mao Zedong Thought and Deng Xiaoping Theory, while believing the Gang of Four to have been left-deviationists and the Cultural Revolution to have contained more excess than was worth.