Max Brooks wrote my two favorite zombie books: The Zombie Survival Guide and World War Z. He did an amazing job of really thinking through what an actual zombie attack would look like, and how to defend against it. Neither of his books has a central narrative or protagonist, but they were still fascinating.
Horror seems like a strange thing to enjoy reading: why would you want to be terrified while mental images of grotesque bloodshed are burned into your head? What’s wrong with you?
Of course, nothing’s wrong with you. One of the jobs of fiction is to give us clues on how to survive, and seeing how characters defeat horrific beasts gives us hope in fighting our own monsters.