For readers of esoteric history, modern occultism, and spiritual biography—this is the story of how a Beast and a Priestess birthed an Aeon. They never shared a temple, yet Aleister Crowley and Dion Fortune changed the course of modern spirituality. He—the self-styled Great Beast 666, prophet of the Aeon of Horus. She—the Sea Priestess, mystic of the Moon and revealer of the Goddess. Together, their lives coiled around the same current of Magick like twin serpents on a caduceus—sometimes reflecting, sometimes opposing, always balancing. In this daring and illuminating study, Alan Richardson traces the mirrored destinies of these two occult giants—following them not forward through time but backward, from death to birth, as if the reader were performing Crowley’s own “Magical Memory.” Along the way he explores their secret correspondence, their shared struggle against darkness in the Second World War, and the mythic legacies they left behind—the Law of Thelema and the Return of the Goddess. Written as both history and initiation, Aleister Crowley and Dion Fortune reveals how their combined current continues to shape the esoteric revival, modern Paganism, feminist spirituality, and the rediscovery of the sacred feminine itself. The book doesn’t just inform—it transforms, training the mind in the patterns of Magick they lived and breathed.