It's remarkably hard to describe A Landing on the Sun
without giving something away, since for quite a while you don't even know what genre it belongs to. Some of my early hypotheses were a bureaucratic comedy of manners; a Kafkaesque study of alienation; a science-fiction novel; a police procedural; a parody of Wittgensteinian linguistic philosophy; and a metaphysical thriller. I really don't want to spoil things for you by saying which of these guesses, if any, turned out to be correct!
The book is inventive, moving, well-written and often quite funny. I couldn't put it down, and finished it in a couple of days. I'm not sure why it's almost unknown. Maybe because it's so difficult to write a sensible review?