It’s been so long since I read Grass (or any Tepper actually – I’ll have to address that by digging out my old books) but I seem to recall a pretty stunning reveal that flipped the story on its head right in the middle of the book. Maybe it’s not as stunning as I remember it and maybe a single “twist” shouldn’t be all it takes to elevate a novel to the upper echelons but it definitely has stuck in my brain for 20 years or so.
Family Tree equally caught me by surprise with its revelation.