Iron Flame is the second book in the Empyrean series by Rebecca Yarros. The first book was The Fourth Wing. If I had to characterize this series, I would say it is a little like Harry Potter meets Game of Thrones. As incongruous as that pairing may sound, I think it works. But like the Game of Thrones books, this series is not for children. Violet Sorrengail is a student at a military academy with dragons. Dragons are part of the training, but in this case it is more like the dragons are saying “how to train your humans”. In the first book we learned the dark secret that separates her group of friends from the rest of her classmates (from the rest of her country). But Violet is a scholar as well as a soldier, so she has to try to work out answers, not just solve them by brute force. In this book, Violet and her frustrating love interest Xaden are walking a tightrope, trying to do what they can for the cause without alerting the leadership with what they know. They are also...