""A Prisoner of the Khaleefa: Twelve Years' Captivity at Omdurman"" is a memoir by Charles Neufeld, detailing his experiences as a captive of the Khaleefa in Omdurman for twelve years. The book is set in the late 19th century, during the time of the Mahdist War, which saw the rise of a religious movement in Sudan that sought to overthrow British rule. Neufeld, a German Jew, was working as a trader in Sudan when he was captured by the Mahdist forces...