Secret Agent 666: Aleister Crowley, British Intelligence and the Occult : - by Richard B. Spence

Why this one is worth looking at - according to official description

"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 that Crowley played a major role in the sinking of the Lusitania, a plot to overthrow the government of Spain, the thwarting of Irish and Indian nationalist conspiracies, and the 1941 flight of Rudolf Hess. "

All of which sounds like something or someone one ought to know about. ”