Daughters of War, by Hilary Green.
This book follows the story of a well-born young English woman who is bored by and trapped in her mundane carefully-prescribed existence and runs away to become a nurse in Bulgaria during the war taking place there in the years prior to World War I.
There is absolutely nothing about this book that I did not adore. From the first minute I was drawn into the story, and had to keep reading and reading and reading until the last page, and then wished there were more pages. The only complaint I can think of, and it is a minor quibble, is that things seemed to happen a bit too easily at times -- the two female protagonists seemed to have too easy of a time running away from home, talking officials in other countries to allow them to do things -- take their personal car on a train heading to the front lines, for example -- being accepted even when Lenore begins dressing as a man (even though she does it for a good reason!), and learning languages at the drop of a hat. At times this gives the story a hint of unreality. Nonetheless, I found myself laughing out loud at the pitch-perfect dialogue, getting caught up in the excitement of Lenore's adventures, feeling overwhelmed by her helpless to help everybody that needed help, and nervous along with her the potential discovery that she is a girl. This was a delightful read, and I am looking forward to reading the rest of the books in this series. 4.5 out of 5.