One year after the initial zombie uprising, the survivors have found safety on top of a mountain. With food supplies dwindling and a drought causing a lack of drinkable water, they make the decision to flee from the mountain and try to find safety elsewhere. After leaving the mountain, they encounter the starving, decaying undead, make new allies, and new enemies.

Z Day is Here: One Year Later is the second book of the Z Day is Here series. With the popularity of the first book, a second was ultimately a guarantee. Fans will see where their favorite characters are and will learn the fates of all involved.