After an unexplained nuclear event, a young woman Ann has been living as sole survivor for at least a year or two on her parents’ farm in a valley which seems to have been shielded from the radiation that has killed most if not all other people. One day, another survivor stumbles upon her patch: Mr Loomis, infected with radiation sickness. Ann nurses him back to health. As his strength returns, Mr Loomis begins to help out around the farm to amongst other things ensure they have food to survive the next winter.