The Faith of Beasts by James S. A. Corey
Holidaying with two small children meant that I read excruciatingly little over the last week; even less than my usual bedtime/middle of the night routine. When I first started it I realised that whilst I'd remembered the broad strokes from the first book (aliens come, kill people, take others away, things happen in the new place) I'd forgotten huge chunks of important details and couldn't distinguish between the characters at all. I ended up having to do quite a bit of LLM interrogation before I actually started, and even then I don't feel like I got the most out of it. Again a plea for authors to include a reference or quick summary!
Partly because of this, and partly because it's very much a middle trilogy book where there's a lot of setup that isn't resolved, it swung between 3.5 and 4. I settled on 4 because I do really enjoy the world and the story though. This book is particular is quite bleak (even more than the first?). Dafyd is struggling with the weight of humanity on his shoulders, and he sinks more and more into stresses of management and responsibility, with a lot of moral conflict. There's a lot of death; more of the core group of the characters go. We get some insight into the war, and there's some interesting semi-reveals, but we're yet to see what will come of it all. In this book Jessyn was my favourite character, seeing her arc developing even further into a hardass soldier (still with mental health issues but not focused on that).
I'll look forward to book 3, but will inevitably forget a load of details again before then!