The passage

First, the unthinkable: a security breach at a secret U.S. government facility unleashes the monstrous product of a chilling military experiment. Then, the unspeakable: a night of chaos and carnage gives way to sunrise on a world forever altered. As civilization crumbles into a primal landscape of predators and prey, two people flee in search of sanctuary: FBI agent Brad Wolgast, a good man haunted by what he's done in the line of duty; and six-year-old orphan Amy Harper Bellafonte, a refugee from the doomed scientific project.