The Dead Are Rising — Jeff Norton

The Changsphere offers a safe haven for the Uploaded, and with more processing power than the Southern Corner could ever offer, the Uploaded begin to grow, develop, and yearn to be alive again. With the Changsphere offering competition to the Metasphere, more and more avatars take up residency in it. But the Uploaded begin to prey on live avatars, infecting them, and their users, with their personalities and becoming reborn in the real world. The dead are rising. Now reborn into the real world, the once dead avatars will not let anyone shut down the Changsphere - the source of their rebirth. Meanwhile, Jonah, Sam, and Axel struggle to keep the Metasphere safe from Granger's assault on the Western Corner, which is housed in the old subway lines under New York City. But Jonah struggles with whether they are doing the right thing: in fighting Granger, they face a more dangerous virtual world, where millions of Uploaded now roam freely, stalking users for their virtual avatars and their real bodies.