Middle books have it tough. The intriguing setups happen in the beginning, and the satisfying conclusions happen at the end, and the rest is just the slog in between. This middle book keeps things interesting by spending half the story with Nassun, Essun's daughter, who was a complete mystery in the first book, but turns out to be more like her mother than either of them realize. It also provides more revelations about the Guardians, the stone-eaters, and the nature of the strange power contained in the obelisks. I'm excited to find out how everything comes together in the third book.