An interest twist on the alien conquerer trope with fascinating ideas and a surprising ending.

This spans a few generations, each with interesting characters and even if it's actually a fairly short book, it twkes enough time for each generation, with all of them revealing something new and changing the world in a way that isn't that typical for fictional futures.
A lot of creativity was put into this book. I liked the portrayel of the overlords, how their characters were the only ones surviving all the years covered in this book and how the reader as well as the human characters are never 100% sure what their motives are.
This felt really fresh for how old it actually is, sure the technological progress we made between the first publication of this novel and now is obvious, but apart from that this is a speculation that hasn't become overdone over time.