In Shadows — Jeff DeGordick

After a brutal fight with the maniacal serial killer, Sarah has come out of it stronger and wiser. She leads her own group of survivors on the outskirts of Raleigh. But as they hunker down one night against the dead pounding at the gates, they witness something none of them saw coming. The zombies are changing. A new kind of the undead comes out of nowhere, faster, stronger, and more vicious than before. They feast first on other flesh-eaters, transforming them into the terrifying new breed. Now they can break down the gates. Now nowhere is safe for the survivors. And hidden behind the dark veil of the city, Sarah and her allies discover a sinister presence lurking in the shadows and pulling the strings. One that is well-equipped, well-coordinated, and far more dangerous than anything they've faced before. If Sarah wants to survive, she has to gear up for the fight of her life against a foe who seeks the very destruction of all mankind...