Elderly married couple Hilda (Peggy Ashcroft) and Jim Bloggs (John Mills) have their quiet, simple lives in the English countryside interrupted when they learn of an impending nuclear attack. Not completely understanding the gravity of their situation, Hilda and Jim react archaically and insufficiently after the attack - and the film takes a dark turn as the radiation begins taking its toll on the unsuspecting couple. This cautionary tale is both humorous and macabre in its consideration of one of the most horrific possibilities of modern life.