The Mountain in the Sea is a surprising and special book. I sorted it into Science Fiction but it would fit into Psychology, Philosophy, Dystopia and even Nature just as well.
It deals with "out there" topics such as future technology like personal face scramblers and invisible drones at the same time as all-time classic questions like "What is consciousness?" and "What is culture?" while being very educational about the lives of octopuses.
Ray Nayler juggles all these topics while still telling an engaging story about our relationship to nature, ourselves, capitalism, and.. aliens. It really is an impressive feat.
I don't want to spend too many words on what the story is all about because I feel like it's worth experiencing for yourself, if you're only slightly interested in one or two of the aforementioned topics.