Not to spoil too much of the rest of the Hyperion Cantos if you’ve not read it, but I found the way each book brought into question the “reliability” of previous parts of the story super interesting. On the one hand - it can feel like a lazy rewriting of history to suit later stories, but I think it actually works super well because you pretty much have to re-evaluate the entire story multiple times. I came away feeling like I’d experienced 3 different, but equally-compelling versions of the story by the end!