Books in the Roadtrip Z series

Cotton Crossing was a dead end, but not for Ginny Mills. She's just marking time, getting experience in the county library system, before moving back to a decent urban environment. Then the phones stop working. Lee Quartine knows there's no way the pretty girl at the library will even look at him. Especially since he can't open his mouth. He knows he's a hick, but when the power starts going out and the woods are full of strange creatures, it's good to have someone around who can build a fire. And kill. Ginny and Lee and their small band of survivors can't stay put, and moving is dangerous. The infected are shambling in the hills and the concrete canyons of cities. It's gonna be a long trip…