Reynolds writes really well about cold places. I loved Permafrost but it was too short and I wanted a lot more. I didn’t love Revelation Space because it was a bit too much of an epic spacer and a bit too dull (for me, maybe it’s good for others). This book is what I wanted! Long and complex, but there’s enough momentum to keep it going. It’s about ice miners in space who see something odd, follow up on it, and it changes the course of humanity. Lots of good female characters.