A believable apocalypse and it seems like the author actually did his homework to make it somewhat accurate. Some parts were a little boring, but things picked up around halfway through. I also liked how there's a good mix between bad people and good people. So many apocalyptic books/movies assume that everyone will turn evil when the apocalypse happens and I just don't buy that. Lots of people in this book and good and try to help others. And some people are bad and hurt others.