Black Monday - R. Scott Reiss

Airplanes fall from the sky, power plants explode, millions of people die.

A mysterious virus infects Western civilization and hurls the world back into a dark Middle Ages. Hunger, cold, and despair reign; neighbors turn into enemies. The virologist Greg Gerard is the only one who suspects the true cause of the catastrophe. To prevent disaster, he must leave his family behind, helpless. Alone, he fights his way through an America on the brink. A perfect killer follows his trail, murdering anyone who gets close to the truth.

Nothing will ever be the same again.