Dead Pulse Rising: A Zombie Novel

Slavering hordes of the walking dead rule the streets of Baltimore, their decaying forms shambling across the ruined city, voracious and unstoppable. The remaining survivors hide desperately, for all hope seems lost... until an armored fortress on wheels plows through the ghouls, crushing bones and decayed flesh. The vehicle stops and two men emerge from its doors, armed to the teeth and ready to cancel the apocalypse.
This is K. Michael Gibson's "Dead Pulse RISING."