Set near the very end of WWII, with some jumps in time, it’s about a single line of women who are trying to get humanity into space. They don’t remember why, but they have very specific rules they live by. Most of the characters (not the main ones) were real people and most of the events were real (some minor details changed), which makes this totally fictional story completely plausible. Also, someone is hunting these women and trying to stop them. It was really good.