Oh wow!! This book is one which will absolutely stay with me. I haven't stopped thinking about this one since I finished it. 
My Grandad fought in WW2 and had a medal from the Queen, so this is a period which fascinates me and I love books set in this period. 
This book has been an emotional rollercoaster that I was not prepared for. The author has completely pulled me in and I have found this book completely addictive and unique to anything I've read previously. 
Natalie is a wonderful main character, a reminder of the strength that was demonstrated by individuals during this time period. I have loved her from very early on, this book has brought tears to my eyes and given me goosebumps. 
After reading this book, I am a converted fan of this author. The book has stirred up an emotional reaction that I wasn't expecting. 
This is definitely a five star read, one I will be highly recommending and a book I know a few friends would love.