Egypt in the ninth century ad: an Arab, Muslim ruling class governs a country of mostly Coptic-speaking Christians. After an exorbitant land tax imposed by the caliph’s governors sparks a peasant revolt, Budayr is dispatched to the marshlands of the Nile Delta as an escort for a church-appointed emissary whose mission is to persuade the rebels to lay down their arms. But he is soon caught up in a swirl of events and concerns that alter the course of his life irrevocably, setting him on a path he could never have foreseen. The events that befall him and the insights he gains from them bring about a gradual but inexorable personal transformation, through which his eyes are opened to the fundamental commonalities— practical, spiritual, and existential—that...