On a regular school day in a small California town, a mysterious outbreak begins at a local high school. Students and teachers all around start turning into blood-thirsty creatures, and just three students are able to escape the school grounds to make their way home. It is not long before they realize they may be the only people in town still alive. Learning quickly to adapt to an unimaginable environment, they must find a way to survive. When Dustin Grey and his friends start to piece together the truth, they realize that saving their own lives will not be enough. With determination and ingenuity that cannot be taught in a classroom, it is up to Dustin and the few survivors he meets along the way to form an unlikely team that must fight to protect its own and save all of humanity from . . . the Z virus.