The Prisoner of the Dead - Dead World, #1

Only when he loses his freedom does he find hope... Baron is a man from nowhere in a land that has forgotten its name where the dead walk. After killing a strange man in cold blood, Baron finds himself imprisoned-and inextricably tied to an even stranger woman, Thalia. Thalia harbors a terrible secret. The daughter of immortal scientists, she knows that the zombie outbreak is cyclical; those infected will live again, and generations later, a new outbreak will run its course.
And she alone might hold the key to ending the vicious cycle once and for all. But only if this unlikely pair can survive the next outbreak...