Since the completion of the Forbidden City, many historical mysterious cases have long attracted the attention and aroused speculation of countless people. So what is the truth of these suspicious cases? From Xingjing (Hetuala), Dongjing (Liaoyang), Shengjing (Shenyang) to Beijing, from Nurhachi, emperor Taizu of the Qing Dynasty, to the last emperor Puyi, these cases span a long time and cover the emperors' family affairs and palace secrets, which are rarely heard for outsiders. Based on first-hand historical data, the author has selected more than 200 pictures and conducted detailed textual research to explore history clues and discover the truth behind them.