The premise is not unlike a zombie movie, in that the virus turns people to remorseless, homicidal maniacs, and is spread via bodily fluids, often bites. The zombie genre, unlike most horror, is not about the fear of the unknown. Vampires, demons and aliens are dark fantasies that scare us with strange, unfamiliar things. Zombie horror, on the other hand, are about the fear of the familiar. The fear of someone close to you suddenly turning against you; the fear of inevitable death. But the genius twist here is that The Crossed are not undead, they are not simply monsters. Making them merely sadistic, demented humans takes the story one step closer to home. Thus, Ennis expertly takes the zombie genre one step further by removing the reader's safety net.