Polite Paradise

Any recommendations along these lines: I read Penumbra's 24-Hour Bookstore and really liked it. I liked the mysterious secret society that wasn't all about creepy murder-y stuff.

So something like that. Secret societies, existing right under our noses, a bit of magic is OK... and if they are out to destroy the world, they're at least not doing it one gory murder at a time?

I just read and enjoyed Matt Haig's "How To Stop Time," which might fit the bill. The main character is part of a group of people who age very slowly, so he is 500 years old but looks 40. Part of the book is telling previous parts of his life and part is set in the present day. https://www.goodreads.com/book/show/35411685-how-to-stop-time