There are 3 books in the The Monster Island Trilogy series. The newest book is Monster Planet which came out in 2007.

It's one month after a global disaster. The most "developed" nations of the world have fallen to the shambling zombie masses. Only a few pockets of humanity survive -- in places rife with high-powered weaponry, such as Somalia. In New York City, the dead walk the streets, driven by an…
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2
Monster Nation

Book cover of Monster Nation
In the heart of America, in the world's most secure prison, something horrible is growing in the dark. A wave of cannibalism and fear is sweeping across the heartland, spreading carnage and infection in its wake. Captain Bannerman Clark of the National Guard has been tasked with an impossible mission:…

3
Monster Planet

Book cover of Monster Planet
Set twelve years after the shambling zombie masses have overrun Manhattan, America, and the world, Monster Planet is the mind-blowing conclusion to what must be the scariest trilogy ever. Oceans of blood, scattered limbs, wanton violence, and general mayhem abound, along with revivified mummies, a Welsh sorcerer, and Wellington's signature…