I'm currently reading "The Beast in Berlin", a book by Tobias Churton about Crowley's activities in Berlin between 1930 and 1932. It does a good job of tracing the links between the O.T.O, the Theosophic Society, Crowley's own A:.A:., the Fraternitas Saturni, and the roles played by persons such as Karl Germer and Israel Regardie. The occult world of that era was just as small and interconnected as is today's, it seems. Not too taken in by the writing style, a bit too bombastic for my taste. But that may be just me. And it fits the main protagonist, undeniably. Recommended to anyone who likes to read biographies, or is interested in the history of Western esotericism.