Of course, it's not just Gone percolating in my head. There's also this new idea named Ratline.
It's about a girl and her mother in 1945, who have flown to Germany to meet up with the father/husband. They have always assumed is a mere diplomat, but he actually spent the war working for the OSS, the forerunner of the CIA.
While in Germany, she befriends a local girl and her family who are trying to emigrate, meets a young soldier she starts to like, sees the horrors of the war from the other side, and ends up stumbling onto a plot to smuggle Nazis out of Germany -- the Ratline. A plot her father may be opposing, or may actually be a part of.
That's all there is right now of that one, but it's got a lot of potential. It won't go away, for one thing, which is always a good sign.