One book that examines this scenario is "One Second After" by William Forstchen [0]. It involves a coordinated EMP attack over America and the effects on a small town in North Carolina. In the same vein as The Road but more detailed in how society devolves i.e. how people behave and what is valuable / scarce as the event progresses. It is not pretty but a fascinating read that will make you consider such a scenario and how you can better prepare.