A dramatic history of Pu Yi, the last of the Emperors of China, from his lofty birth and brief reign in the Forbidden City, the object of worship by half a billion people; through his abdication, his decline and dissolute lifestyle; his exploitation by the invading Japanese, and finally to his obscure existence as just another peasant worker in the People's Republic.

《紫禁城的黄昏》记述了困居紫禁城中“清室”的黄昏时期——1912年至1924年——从中华民国成立到溥仪出宫期间的历史，庄士敦以帝制向共和的转变为历史背景，以担任帝师，与末代皇帝溥仪共处的经历为内容，对他耳闻目睹和亲身经历的大小事件做了独特的记述，通过对事件的记述表达了他的基本思想——政治上的复辟主张与文化上的保守主义。