The only thing that didn't thrill me about this book was the cover. I would have rather seen a silhouette of a girl in WWI era clothing set against the background of a Luxembourg street of that era. This cover looks too modern.
My favorite part of this was the fact that Samantha learns that the world is not all black and white. The war is not necessarily divided into "us" and "them". This makes it hard to know whom she can trust, but she is young enough that she can still see Germans as good people, no matter what her government tells her. It helps that she spent some time in Germany as a child and has good memories of being there. Her struggles in assessing her feelings and weighing them against her loyalties to La Dame Blanche as well as her country are realistic and poignant.
Readers of spy adventure mysteries like Lee's The Body in the Tower as well as Carter's The Gallagher Girls will be enthralled with this story of divided loyalties, romance, and intrigue set against the backdrop of upper class society during World War I.