This is one of those cases of something where I liked the concept more than the finished product and wish it had been a video game, or TV series, maybe a radio serial. The world-building is fantastic and I loved it - even when it felt patchy the detail, the ideas, the way it effected the world was absolutely great. However it just didn't work as a story for me.
The book is split into 4 parts (and an epilogue) that, roughly speaking, take place in different parallel universes. This is right up my alley, but really wasn't my favourite aspect here. What is really great about this book is how the idea of a world without slavery plays out (the author's note at the back states what the background of this actually is, and honestly I'd probably recommend reading that first). The story has a slightly odd sense of building to a finale which never really appears, and is probably a lot more realistic than many books in that it all ends up feeling a bit random and listless and pieced together with no real purpose or conclusion, despite the underlying thread that randomly pops up every so often. This doesn't really work in an alt universe, though, especially when we are introduced to so many intriguing plot points (largely in the first part) that remain completely unexplained despite the insinuation that there are answers, even known by the narrator in places. Overall it doesn't read brilliantly, so to enjoy this book you have to either be really invested in the premise or just adore the writing (literary, a style I find more in short stories - I liked it but not enough to read 400+ pages without compelling characters or plot).
Part 1 introduces an alternate world and shows several disparate events over the course of several years. It's a series of snapshots and the chapters start with abstract paragraphs, which make more sense as you continue but as a writing style this completely changes in the rest of the book. It's more an extended introduction, and feels a bit like a series of promotional blog posts shoved in due largely to being differently written to the other parts. Once I got into it I liked it but I found the misogyny pulled me out of it quite frequently - there's an inability (that does continue in the rest of the book) to treat women the protagonist has some form of attraction to as people. The women he's attracted to are often major players in the whole book, but never really form actual characters, particularly compared to women he isn't interested in sexually or male characters. There's also a lot of gratuitous descriptions which are presumably supposed to express attraction without being crude but end up sounding like that guy who slides into your DMs to call you a goddess using words of 3 syllables or more and then turns out to be a stalker or an incel who sends pages of threats when you don't reply. So there's that.
Part 2 was by far my favourite, and makes up the bulk of the novel. Firstly, most of the real world-building happens here, in terms of the actual world this part takes place in but also in terms of the spiritual practices and cultural nuances. I especially loved the description of English and how it's used. This part is also a pretty gripping self-contained story, and the best bits of the other sections refer to events in this part. It works well as a story, world, for building many of the characters, and occasionally is rather profound. If this was the whole book I think I would have liked it more, even though it would definitely lose something from the recurring threads through to other times.
Part 3 was good in terms of setting and description, but also my least favourite part and the only one where I had moments when I HATED it. I can't say why without sort-of spoilers but a large part of it was that, as a sapphic person, bits of it made me exceedingly uncomfortable.
The final part was fine but rushed. It felt tacked on to the end in a hurried attempt to deliver on the promises of previous parts and to make the book make sense. It came across as scrambling after the fact for a conclusion, which was hugely anticlimactic and unsatisfying. It might have worked better if it was longer, or more fleshed out. As it is it felt like a serious of "big reveals," none of which were big or had any impact on the story. The whole book might actually have felt more complete and satisfying without this part at all, just 1-3 and the epilogue.
Generally I would really like to see the idea taken and maybe reworked with a team (including women and queer people) for something else, because I do love the (well-researched and thought out) idea, and clearly Newland can write; I just didn't like it as a book.