In this important new book, the distinguished Egyptologist Jan Assmann provides a masterful overview of a crucial theme in the religious history of the West – that of 'religio duplex', or dual religion. He begins by returning to the theology of the Ancient Egyptians, who set out to present their culture as divided between the popular and the elite. By examining their beliefs, he argues, we can distinguish the two faces of ancient religions more generally: the outer face (that of the official...