Here is a brief summary of Z1N1: The Zombie Pandemic is about in Mr. Cook's words: "This book is set in the near future and is basically two separate stories that merge together as one. The crux of the story is that an H1N1 vaccine is created by some well-intentioned researchers (even though they are slightly distracted by real life events). This vaccine is sent throughout the U.S. and other countries. Due to events that unfold in the book, the vaccinated individuals eventually die and return as the undead. "