While coming to terms with his dad's recent passing in a tractor accident, 13-year-old George McCray is living with his grandparents on their Kansas farm. George misses his mom, Jill, who has moved to Minnesota to deal with her grief, but there is the promise of their reunion at Christmas. George feels needed on the farm as he helps his grateful grandfather Bo with daily chores and comforts his grandmother Cora. He has also made friends with Mary Ann and became attached to Tucker, the smart and friendly dog the McCrays take in when his troubled owner Frank Thorne lands in jail.

In a post-zombie world, where the infected live normal lives, their retroviral drug is running out.