"Memoirs Found in a Bathtub" by Stanisław Lem, a confusing book about spies and symbolism.
It's possible that every character in this book is a spy, including the narrator. Or not. It's not obvious what are the actual roles of every character that appeared, and whether they are aware of their own assigned role in the first place. The whole book is about the narrator figuring out what he is supposed to do, against the background of many seemly inconsequential events that were somehow progressing exactly as planned by some unknown force. At a few points in the book, some character would explain what exactly happened a few chapters ago, which don't seem to help with giving any guidance as to what the mission is supposed to be, but more to enforce the idea that everyone else knew what's going on, except you.
There is a dialog regarding triple spies in chapter 11 (page 155), which felt like a representative sample of all characters in this book:
You think someone's one of us, but they got to him and then he wasn't any more -- and then we got to him, and he was -- but he still has to look like he isn't, that is, like he only looks like he is! But they get wise to him and -- now he isn't again, but he has to look like he isn't -- or we'll get wise -- and that's a triple!
Throughout the book, there is the idea that the building where all plot took place is itself alive, and that the narrator and other similar characters before him act according to the will of the building. If we think of this building as a kind of role playing game, we can imagine how the characters all following a predefined scenario, and the bathtub is equivalent to the save point in those games. With the building-as-a-game interpretation, whatever the narrator does didn't really matter as long as he walks to the next room so that the readers can make progress.
Compared to Fiasco, this book has a more puzzle feel than a sci-fi feel, but it does feel consistent with all Stanisław Lem's books that I have read so far. The puzzle aspect of trying to find a fitting interpretation to all events was confusing, but I had a good time reading through all pages.
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