A unique and compelling look at women during WWII

I enjoyed this book, it was a great read and a very different way to look at things, but it wasn't as engrossing as I had hoped it would be. A woman in a train station in New York City finds a suitcase with photos of women in it. She takes the photos for a reason she isn't sure about. She finds out later that the suitcase belonged to a woman who was killed that day. As she investigates the photos, the story keeps flashing back to the women in them and how they served England as spies during World War II. I think the characters were well written and that the dual perspective was captivating and easy to follow. The focus in this book wasn't just on surviving the war, but how it impacted people in the aftermath as well.