If you're having a fun, happy day then this is probably not what you want to read- a fictional account of a devastating nuclear attack on America. It's absolutely chilling.
Back in early October, 2006, North Korean President (for life) Kim Jong Il had announced the detonation of a nuclear bomb deep in a tunnel in the stony mountains of North Korea. The seismic signature had been small, and American intelligence at first doubted whether it had been a nuclear explosion at all. Traces of radioactive emissions were detected a few days later, and the intelligence estimate revised to conclude that it had been a failed test that produced perhaps only 10% or less of the expected yield, only 0.5 to 1.5 kilotons, not the 20 kilotons, at least, that Western intelligence had anticipated.
Kim Jong Il gloated. The deception had worked. The Americans were thinking in terms of long range intercontinental ballistic missiles with huge warheads that they could shoot out of the sky with their sophisticated billion-dollar anti-missile defense systems. He was thinking in terms of small warheads carried by small, medium range cruise missiles that could be launched from many places, and infiltrated close enough to slip in under the radar and hit America's coastal cities.