In literary circles of the mid-twentieth century, father and son, Ikbal and Idries Shah, spread seductive accounts of a mystical Middle East. Pitching themselves as the authentic voice of the Muslim world, they penned travelogues and exotic potboilers alongside weighty tomes on Islam and politics. Above all, father and son told Western readers what they wanted to hear: audacious yarns of eastern adventure and harmless Sufi mystics--myths that, as...