I like most of KSRs books and this was no exception. It’s kind of about Mars and kind of about a mysterious “icehenge” that shows up on Pluto. It’s told from the perspective of three different people (sequential, not interspersed) and an “Is this an unreliable narration and if so why?” mystery slowly creeps in as the book goes on. It’s one of KSRs older books, so quirky in what “tech” they have and what they don’t. Like you see very few digital cameras and no cell phones though there are interstellar spaceships. I skimmed a few parts but overall liked it.