This book is set in a universe where George Romero's 1968 film "Night of the Living Dead" was a documentary. The '68 outbreak was put down fairly successfully, but the world remains fearful of a second, worse outbreak. On the night of the '68 outbreak, a young woman is found dead by a roadside in Iowa, with a dead baby in her arms. Well, actually, an *undead* baby. The woman who discovers them decides to protect and shelter the babe. Eventually, mysteriously, he begins to grow up. This is his story.
So, it's a zombie story, and, at least at first, a YA coming-of-age novel. That changes radically when he discovers that he isn't the only 'surviving' undead from the first outbreak. To try to pin this book down to any small number of genres is to deeply misunderstand Gregory as an author. He's a man who *loves* genres, and both understands and abides by their rules. But he will switch genres on you without warning, once a chapter or more, to tell the story he wants to tell. He's very much a 21st century author, a child of remix culture. So before it's done, this novel passes through political thriller, science fiction pastiche, horror novel (of course), post-modern literary fiction, and more (that would be spoilers to detail).
I think that's why I had mixed feelings on my first read. I enjoyed each of the genres that this novel turns into, but I wanted more of each of them and missed them when they switched. But Gregory is a parsimonious writer. On a second read, I appreciated how much evry piece of the book was necessary, with no wasted scenes. Even some seemingly-minor tidbits of youthful characterization turned out to be important plot setup. In one bravura section, he takes plot incidents that other writers would spend a hundred pages on, and reduces it to a single-page bullet list summary, because that's all that's really needed for the story he wants to tell.
This is a book that will confound your expectations. If you're the kind of reader who can deal with that, it's highly recommended.