The Abbasid dynasty was perhaps the greatest in Arab history, and the greatest of the Abbasid rulers was undoubtedly Harun al-Rashid. His mother, Khaizuran, and wife Zubaidah are the 'two queens' of this book. Abbott recounts the lives of these two women, who flouted the taboos of Muslim society and made their imprint on a key period of early Islamic history.