Attention grabbing historic fiction!

I have read historical fiction before but nothing like this! I'm so intrigued about how Marie gets along being a secret agent and if she ever gets back to her daughter. I think Eleanor is a very interesting character as well and I really would like to know more about her and her background. I'm also wondering why Grace decides to go back to the station for the suitcase and how she starts discovering all the women and what she finds out about them. It sounds incredibly fascinating and the First Look definitely kept me wanting more!