Donlon R.T. Donlon 
Walls [EPUB ebook] 

Henry Walters has set his mind on a return to the overrun, quarantined city of Boston to find his girlfriend. To Henry, rescuing her may seem as momentous as a zombie tale can get, but he will soon discover that there is much more to his story than outrunning the Dead. A greater evil lurks and will attempt to change the world for the worst.