Sea of Silver Light: Otherland Book 4 (Unabridged‪)‬

A group of adventurers searching for a cure for comatose children find themselves trapped in a sequence of virtual worlds, the only opponents of a conspiracy of the rich to live forever in a dream. Now, they are forced to make an uneasy alliance with their only surviving former enemy against his treacherous sidekick Johnny Wulgaru, a serial killer with a chance to play God forever.
Few science fiction sagas have achieved the level of critical acclaim-and best-selling popularity-as Tad Williams's Otherland novels. A brilliant blend of science fiction, fantasy, and technothriller, it is a rich, multilayered epic of future possibilities.