Who is Allah? What does he ask of those who submit to his teachings? Here the Pulitzer Prize-winning author of God: A Biography offers a probing, revelatory portrait of the world's second largest, fastest-growing, and perhaps most tragically misunderstood religion. In doing so, Jack Miles illuminates what is unique about Allah, his teachings, and his merciful temperament, and he thereby reveals that which is distorted or simply absent from the popular conception of Islam. So, too, does Miles uncover the continuity of the Islamic tradition with those of Judaism and Christianity, finding deep affinities among the three by setting passages from the Hebrew Bible, the New Testament, and the Qur'an side by side.