“One Second After” by William R. Forstchen – The Realistic Apocalypse
When we think of all the types of apocalypses which could come ( zombie apocalypse , meteors, the four horsemen riding in from the skies), we often tend to omit one type of world-ending event which is disturbingly real: a large-scale electromagnetic pulse (EMP) blast capable of knocking out all electronic devices and make them obsolete. Needless to say, this kind of technology already exists, and considering that military institutions are always 50 years ahead of what is available to the public (for example, 3d television was invented in the 50s by the U.S. Army but only declassified recently), chances are that EMPs have already been weaponized.