Young lovers Ruth (Karen Meagher) and Jimmy (Reece Dinsdale) decide to get married after Ruth unexpectedly gets pregnant. But their quiet lives in Sheffield, England, are threatened when the Soviet Union and United States go to war. After a nuclear attack destroys a NATO base 20 miles from Sheffield, the town falls into chaos. Ruth and Jimmy are separated as the fallout spreads. Ruth must struggle to survive alone in the post-apocalyptic landscape.