Following Zarathustra's elusive trail back through time and across the Islamic, Christian, and Jewish worlds, Paul Kriwaczek uncovers his legacy at a wedding ceremony in present-day Central Asia, in the Cathar heresy of medieval France, and among the mystery cults of the Roman empire. He explores pre-Muslim Iran and Central Asia, ultimately bringing us face to face with the prophet himself, a teacher whose radical humility shocked and challenged his age, and whose teachings have had an enduring effect on Western thought. The result is a tour de force of travel and historical inquiry by an adventurer in the classic tradition.