Okay, I really liked this book and I think it would be perfect for your fall TBR. Dark academia (but light on them actually going to any kind of class), dangerous religious obsession, cult/obsessive friendship situation (I got Holy Hell documentary vibes). Burton is very good at writing messed up characters with a cult of personality around them (also loved this in Social Creature). Also a little reminiscent of The Atmospherians, my favorite book from last year.