England, 1959: Two young soldiers --- Drummond and Carter --- form an intense and unlikely friendship at "Doom Town," a training center that recreates the aftermath of atomic warfare. The experience will haunt them the rest of their lives. Years later, Carter, now a high-ranking government official, offers working-class Drummond a way to protect himself and his wife, Gwen, should a nuclear strike occur. Their pact, kept secret, will have devastating consequences for the families they so wish to shield.