Fie was an unwanted princess---her twin sister, Fielle, is the beautiful, kind, perfect princess, but Fie was ignored and left to her own devices. When Fielle is married off to a famous king, Fie is tacked on, but her new country isn't much different than her old country. Determined to take her life into her own hands, Fie dresses as a boy, calls herself Heath, and joins the kingdom's squires.
This was decent, although I felt so bad for Queen at the end. Fie is easy to root for, as she's driven, talented but not unreasonably skilled, and creative. Despite the rather grim backstory, she's also mostly cheerful. And she can be a bit of a terror when she's in the mood for it.
That said, Cain was by far my favorite character in this book. His attempts to rationalize his missions with what's actually happening in front of him make for some great comedy. The whole 18th division is filled with quirky characters, but poor Cain's competence combined with his determination not to overthink things leads to a mountain of stress.
Overall this is a pretty good read. I rate this book Recommended.