Book 1 = An atmospheric EMP attack reduces almost all world technology back to the 7th Century. A chosen group is sheltered inside the Yucca Mountain underground complex in Nevada for two years, under siege by lethal radiation levels outside and a rogue army desperately seeking their food, weapons, and women.
Book 2 - The survivors briefly venture out of their underground refuge in Yucca Mountain only to face battle with hostile foreign survivors. An embedded terrorist causes considerable death and ignites military action where Colonel Bradley’s daughter tests a secret weapon. The survivors prepare for the next radiation storm and take refuge back in the mountain.
Book 3 = the EMP and nuclear winter survivors are finally able to emerge from their underground shelter.. The main body of survivors locate at Nellis AFB with Colonel Bradley and a select group of the military remaining at the mountain to protect the technology archived there and to provide protection for the ranchers and farmers remaining there with the livestock. The nuclear winter returns and disaster strikes a group of the survivors.