Aleister Crowley is best known today as a founding father of modern occultism and his influence can be found everywhere in popular culture. Crowley, also known as the Great Beast, has been the subject of several biographies, some painting him as a misunderstood genius, others as a manipulative charlatan. None of them have looked seriously at his career as an agent of British Intelligence. Using documents gleaned from British, American, French and Italian archives, Secret Agent 666 sensationally reveals Crowley's role in many government plots.