In the summer of 2012, in the dead of night, three peace activists penetrated the exterior of Y-12 in Tennessee, supposedly one of the most secure nuclear-weapons facilities in the United States. A drifter, an 82-year-old nun and a house painter. And if they had been terrorists armed with explosives, intent on mass destruction? That nightmare scenario underlies the government's response to the intrusion. The prophets of Oak Ridge is the story of two competing worldviews, of conscience vs. court, of fantasy vs. reality, of history vs. the future.