I have always loved mysteries, but I think this type of setting is closest to my heart, as it harkens back to Harry Potter which I read when I was younger. The animated show Scooby Doo Mystery Incorporated had a neat mystery like this too, though that obviously was a kids' show and not necessarily the level of maturity I'm looking for. I've heard great things about the book The Secret History by Donna Tartt, wondering if that'd be a good one to start with
by Striking-Speaker8686