I don't actually know what happened here.
Ok, so I know that a solar flare killed off almost everyone on earth. There were two hundred people in the (US?) army. There are ten people left in the world, with type O blood. I don't actually know what the adults do now, but the kids go to school (that's right, they're in SCHOOL!).
Not Hermia though. I think she was a dancer in a strip club? Maybe.
Anyway, Hermia, Nate and a bunch of other kids (aged 17-20) are kidnapped and then put into a freakishly lavish training centre and trained....