The Zombie Eye

15 year old Mackenzie is sitting in school, all of it's boring
Math, Pass. Science, Pass. The history of how zombies took over the world, also a Pass.
It is almost known by everyone that when the virus came out most of humanity survived within walls of cities.
But what she didn't know was that day her adventure with, Z-people, a mysterious eye patched kid in class, and what really happened on October 27, 20xx