The author's note explains how much of the details are fictional, but she was looking for plausibility. I wasn't sure throughout how "plausible" the story line of two young women flying to France during WWII really was, but the story I'd engaging enough that those questions ultimately weren't distracting.

I don't know how much to reveal here without giving spoilers, but suffice it to say that the story odd told in two different voices. It's pretty amazingly fine, and the verite reveals itself slowly through the course of the book. I was sad to see it end because I just kept hoping that the revelations would continue.