Books in the Ashley Parker series

Ashley Parker was a ordinary woman who was also a "wild card," immune to the emerging zombie plague, drawn unwillingly into a shadowy paramilitary organization. Having stopped the wave of the undead that swarmed their facility, the worst is yet to come, as the plague begins to manifest in key locations worldwide.

Having been ambushed in San Francisco, Ashley and the wild cards must pursue the enemy to San Diego. There they will discover a splinter of their own organization, the Dolofonoi tou Zontanous Nekrous, which seeks to weaponize the plague. But that isn't the worst news. The plague has gone airborne, making it transferable without physical contact...