Aground: Book Three in the Wheels and Zombies series

One step ahead of zombie hordes as well as the government agents still pursuing both Mags and Ash, the duo moves west. When a chance encounter leads them closer to safety over the river, they discover that it also brings them nearer to danger-and the evil conspiracy that unleashed the zombie plague on the world! Mags and Ash learn that the secret to defeating the outbreak may just lie deep within themselves. But can the government be trusted? And why are the zombies mutating, growing faster and more intelligent? Once more, Mags and Ash must fight to survive-and they’ll need not just each other, but also some old friends and some new allies if they’re to have any hope of saving themselves and maybe even the world itself.