Books that require effort: need to pay attention, write notes, and figure stuff out

Recently I've discovered what is called ergodic literature and I'm kind of in love. However, it seems a little hard to find.

What I loved about it was that I was taking notes and there was something to figure out. I'm not really interested in the typical detective story, as guessing who the murderer is is rarely work that requires much effort.

But other than that, I really am open to everything.