There are 4 books in the Dead World series. The newest book is Mutated which came out in 2012.

1
Dead City

Book cover of Dead City
A relentless thrill ride. . . Break out the popcorn, you're in for a real treat. --Harry Shannon, author of Dead and Gone

Texas? Toast.

Battered by five cataclysmic hurricanes in three weeks, the Texas Gulf Coast and half of the Lone Star State is reeling from the worst devastation…
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2
Apocalypse of the Dead

Book cover of Apocalypse of the Dead
After a virus turns most of the world's population into fleshing-eating zombies, retired U.S. Marshal Ed Moore and a band of survivors search for sanctuary from the dead and end up at an outpost in the North Dakota grasslands that is run by a preacher who has some frightening beliefs.…

3
Flesh Eaters

Book cover of Flesh Eaters
They Rise...Out of the flooded streets of Houston, they emerge from plague-ridden waters. Dead. Rotting. Hungry. And as human survivors scramble to their rooftops for safety, the zombie hordes circle like sharks. The ultimate killing machines. They Feed...Houston is quarantined to halt the spread of the zombie plague. Anyone trying…

4
Mutated

Book cover of Mutated
They Outnumber The Living. . .

25 to 1. Those are the odds of being struck down--and resurrected--by the savage plague that's sweeping the country, forcing survivors to band together against the dead.

They're Growing Stronger. . .

Even among the living, there is dissention. A new leader known as…