Just because zombies can kill you doesn't mean they're always ruining peoples lives. They just exist, the same way that people do and the same way that everything else does. The zombies have been around for so long that most people have learned how to live without being affected by them. Most of the time.
So when a young woman , travelling with a man she hardly knows, is bitten on the foot, she's faced with a difficult decision: Let the infection run it's course and become a zombie herself, or let him amputate. After losing her parents and not knowing how to trust someone new, putting her life in the hands of a stranger seems to be the toughest situation she will ever be faced with.
Turns out that was the easy part.