How are zombies created? It's a story that most Zombie fiction authors don't dive into very deeply. But, in his novel, Patient Zero, author Jonathan Maberry does an excellent job of showing how zombies might be created as a biological weapons.
He combines science with the creepiness of zombie horror and the suspense of a modern thriller. The result is a novel that meaningfully adds to the universe of Zombie fiction. I highly recommend this novel as it grabbed my attention and held it.