Dead Voltage - post apocalyptic emp thriller

Six weeks after the pulse, Dalton Kerr spends his nights keeping a lone radio alive in a silent world. Then, at two in the morning, a voice breaks through the static. A voice he never expected to hear again. Far to the east, someone has just revealed a location that should have stayed hidden. Now word is spreading across a lawless country where information is more dangerous than bullets. Dalton sets out across dead towns and frozen wilderness toward the woman he thought he had lost forever.
But he isn't the only one listening. As winter closes in and danger moves faster than he can, Dalton must decide how much he's willing to sacrifice for a second chance in a world that may not give him one.