Tooth and Nail

You've got your post-apocalyptic world, you've got your struggle to survive, you've got cannibals, and it's still boring. Civilization collapses and chaos rules when the world runs out of oil. One struggling group has taken over an abandoned hospital, working together to stay alive, which is hard enough--and it only gets worse when a gang of marauding cannibals comes along, looking for their next meal.