Anything by Hermann Hesse. Not mind bending. No Twists. No roller coasters. Just a calm conversation with the author and yourself. And yet, it had a profound impact on me. One poem I revisit every once in a while: https://www.lieder.net/lieder/get_text.html?TextId=119749 If you understand German, I do believe it needs to be read in its original tongue. The translations I found thus far were not entirely convincing.
I "saved up" for The Glass Bead Game - reading about 7 Hesse books before going for his magnum opus. I was severely let down by it. It's all over the place, sloppy. I thought perhaps it was because of the loss in German-->English, but a few German friends (including a few on HN) have suggested the original isn't much better. IMO Narcissus and Goldmund and Steppenwolf are his best.
Instead it seemed like a was harrowingly long weird sci fi fanfic over some vaguely defined but stupidly complex future society imagined in the lamest and most naive almost pubescent mind. Simple in the sense that everyone from the politician to the ascetic guru seemed like complete one dimensional stereotypes.
Also you don't stop reading because of esoteric complexity you might "get" later when you know more of the western cosmology like in fellow complex works like Ulysses (funfact both books are among the top 10 most abandoned), - you stop because it's boring imagined political history. There really doesn't seem to be a whole lot under the surface, and the schisms between "academic life" or a "life of devotion" versus "a mercantile city life", or "life of politics" was incredibly naive with no mythological, historical or even poetic context mirroring our world.
I guess i must have missed something?