Gary Lachman Turn off Your Mind

If you want to lift the lid on crowley's bidet, this is a good place to start. If nothing else, you'll need this book to get a better angle on those public school mates of yours who start waffling on about osman spare and other pseudo sufistic gobbledegook.

If you don't have an overview on esoteric literature this is a great place to start. Unless you're already casting your own spells. I don't see how anyone who has ever torn the flap of a rizla packet could fail to get a buzz out of this book. I would definitely team this book up with "City Of Quartz" by Mike Davis.