I really like his book Ra. It's a great example of secret societies and layers within layers. Although to me it honestly sounds impossible.
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I'd bought it while stuck in an airport trudging through Kim Stanley Robinson's Mars trilogy (which I hated), saw a book by qntm in my recommended list and bought it instantly, having read their online stuff. Unlike the KSR, it was great fun and I blazed through it.
I'm glad I've read it, but I doubt I'll return to it.
I'll definitely be looking for this as a book gift to myself.