The Prisoner of the Dead - Dead World, #1

Trapped in an endless cycle of life and death... When civilization fell generations ago, it seemed to mark the end of humanity... but then the undead inexplicably returned to life. Again and again, the plague rose, the zombies thrived and were then reborn. Into this horrific apocalypse came Baron, a wild man from nowhere, onto the vestiges of the human world. After his keen survival instincts lead him to kill a strange man, Baron finds himself imprisoned by an even stranger woman, the child of immortals who might hold the key to ending the vicious cycle once and for all.
But only if this unlikely pair can survive the next outbreak...