The Mystery of Light is the first book-length account of the life and teaching of the Bulgarian-born spiritual adept Omraam Mikhaël Aïvanhov (1900-1986), who was one of the twentieth century’s greatest luminaries of Western spirituality. He was a disciple of the saintly Peter Deunov (Beinsa Douno), modern Bulgaria’s most remarkable spiritual figure. In 1937, at the behest of his teacher, Aïvanhov moved to France where he taught the timeless secrets of a universal gnosticism for nearly a half century. This book holds great appeal for seekers both within and outside established spiritual traditions.