David Achord - Zombie Rules (#1-3)

Zombie Rules
Zach Gunderson’s life sucked and then the zombie apocalypse began. Rick, an ageing Vietnam veteran, alcoholic, and prepper, convinces Zach that the apocalypse is on the horizon. The two of them take refuge at a remote farm. As the zombie plague rages, they face a terrifying fight for survival. They soon learn however that the walking dead are not the only monsters.

Z14
Zach Gunderson and his friends have carved out a life for themselves in a post-apocalyptic world ravaged by zombies. But, survival is a daily struggle. In addition to frequent encounters with hostile humans, Zach has discovered something very sinister about the zombies.

ZFinity
It's now two years since the zombie apocalypse changed the world. Survival is precarious for Zach Gunderson and his friends. They are encountering zombies who are evolving into something more than mindless automatons and the group dynamic is threatened by the revelation of a murderer in their midst. They handle each situation in their own special manner, but a seemingly innocent encounter with a group of Marines lead to disastrous consequences.