Freemasonry is the subject of perennial fascination. The twentieth century's great scholar of occult and esoteric ideas, Manly P. Hall was a mason himself and nurtured a lifelong interest in the secret fraternal order, making it the focus of one of his earliest and best-loved books, The Lost Keys of Freemasonry. In this celebrated work, he examines the ethical training required of a freemason, and the character traits a mason must "build" within himself.