3.5 stars, rounding up to 4. This is the first Mary Robinette Kowal book I've read, and I thoroughly enjoyed it. Will definitely be reading more in the future! I thought the idea of it was excellent, and I really liked Ginger and the focus on the role of women in the war. That being said, I figured out who the traitor was pretty much exactly at the halfway point and couldn't understand why Ginger didn't. Yes, she is under a lot of emotional strain but under the circumstances it wouldn't have hurt her to think a little bit about why the people around her are reacting as they do.