I've probably read ten or so fiction books about WW2 and they all come from different perspectives. It is a story about two women on different sides of the war, switching between Germany and America. I learned so many things that I had never even heard of before, like Mittelwerk.
I learned about Project Paperclip, the Dust Bowl, & Kristallnacht. It wasn't violently graphic but it had me emotional at times because of how helpless things could be.