Children of a New Earth

For nearly thirty years, since the collapse of society, Freedom Ranch has been self sufficient, hidden deep in the Rocky Mountains. Amy Beland has grown up hating the small valley settlement and the survivalist that run it. Now it will be up to her to save them all. Journeying out of the mountains and into what is left of civilization, they discover that much of what they've been taught about the collapse is wrong.
They don't find the enemy they expect on the plains beneath their home, which is good because Amy suspects they may have brought a couple with them.