"Karl XII as a prisoner" is a fascinating historical book by the Swedish writer Johan Olof Alexander Aberg, which tells about the period of imprisonment of the Swedish king Karl XII after the defeat in the Battle of Poltava. The author examines in detail the conditions of the prison, the life and activities of Charles XII during his imprisonment in Turkey. The book impresses with its depth of research and lively language, which allows the reader to immerse himself in the events and feelings of the main character. This is a must-read for all history buffs interested in the fate of Charles XII and the events of his life.