Any books that have secret societies?

I absolutely adore Vampire the Masquerade, the secret dark wizards in the HP franchise, any kind of underground/mysterious organizations that use unscrupulous methods. Im also a big fan of the cult like organizations described in Lovecrafts work.

I’d love some books that fit this description. I usually like Fantasy but I have certainly enjoyed some Sci-fi too. Bonus points if they have a good narrator on Audible, and I’d prefer a more adult novel, less geared toward YA

by Phantomix117