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An excellent final book in the series! Marie Rutkoski was not afraid to put her characters in dark, dangerous situations with the odds stacked against them. She certainly didn't make things easy for Kestrel and Arin. I also really appreciate the way she showed how relationships are not neat, black-and-white, clean-cut things, but full of uncertainty and emotions that don't necessarily make sense, and that one may not want to even acknowledge.
I did think that the book could have been tightened somewhat; the first half became somewhat repetitive in its exploration of Kestrel and Arin's relationship, and the second half had a few too many battle (and battle preparation) scenes for my liking. (Battle scenes are always quite hard for me to picture, and so they don't do all that much for me as a reader.)
I thought it was clever the way the climactic scene was structured, split between what Kestrel was involved in and what Arin was up to (and plus, I liked how Kestrel's plan involved an element introduced earlier in the book). Also, the opening part of the book, detailing the treatment of Kestrel in the mines (and the psychological toll of that), really made me feel for her and was a way to create conflict in the Kestrel/Arin relationship without relying on a cliche such as a love triangle or "star-crossed lovers."
One thing I would have liked would have been more discussion of the whole issue of slavery; this largely seems to get dropped from the narrative, given the pressing issue of the war going on, but given how very recently the Herrani had been slaves to the Valorians, I think realistically that tensions surrounding that would have been high.
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