A surprise success in 1950 (and an Academy Award winner for best original story), this thriller deals with a sensitive but deranged scientist who threatens to blow up London with an atomic bomb unless the bomb is outlawed. The concern about the real possibilities of atomic warfare was a major one then, and the realistic, near-documentarian treatment of London preparing for disaster and organizing full-scale evacuation hit the same kind of nerve as Orson Welles' famous Martian invasion broadcast. Its success paved the way for tonight's companion film, High Treason. William K. Everson