Blue-Eyed Devil traces a century of American Islam, as well as a 20,000-mile spiritual journey across the U.S., through the perspective of a white convert. Keeping in mind the five permitted purposes of spiritual travel — seeing a holy site, deriving instruction, seeking knowledge, visiting a venerable person, and visiting the tomb of a saint — Michael Muhammad Knight criss-crossed the country in search of a parallel Islamic history, and struggled to understand his own place in that history.