Seventeen-year-old Kella O'Malley is living through the apocalypse. Maybe. She's definitely running from feral cannibals. When a pandemic begins mutating humans into killers during her spring break in Georgia, Kella joins with a group of teens and twenty-somethings to carry precious CDC data north on the Appalachian Trail. With no cell phones and no clue how far the mutation spreads, their only hope is to stay ahead of the "Hyenas" and hike faster...