Tad Williams - Otherlands series

City of Golden Shadows

Renie Sulaweyo, a teacher in the South Africa of tomorrow, realizes something is wrong on the network. Kids, including her brother Stephen, have logged into the net, and cannot escape. Clues point to a mysterious golden city called Otherland, but investigators all end up dead.

River of Blue Fire

Otherland. In many ways it is humankind's most stunning achievement: a private, multidimensional universe built over two generations by the greatest minds of the twenty-first century. But this most exclusive of places is also one of the world's best kept secrets, created and controlled by an organization made up of the world's most powerful and ruthless individuals, a private cartel known--to those who know of their existence at all--as The Grail Brotherhood. Though their purpose in creating Otherland is still a mystery, it may not remain so for long. For they have exacted a terrible price from humanity in the process, and even their highly organized global conspiracy cannot hide the nature of their crimes forever. And now a small band of adventurers has penetrated the veil of secrecy that prevents the uninitiated from entering Otherland. But having broken into the amazing worlds within worlds that make up this universe, they are trapped, unable to escape back to their own flesh-and-blood bodies in the real world. And as dangers and circumstances split their party into small, widely scattered groups, their only hope of reuniting lies in returning again and again to the River that flows--in one form or another--through all the worlds.

Mountain of Black Glass

Otherland, the quartet of which Mountain of Black Glass is the powerful third part, combines some terrifying speculation on the future of virtual reality with adventures no less terrifying because they are technologized dreaming. These are dreams the adventurers cannot awaken from and in which, if they die, they are really dead.

Sea of Silver Light

With Sea of Silver Light, Tad Williams completes his massive Otherland quartet, one of SF's more intriguing explorations of the eroding boundaries of the human and the nonhuman, the living and the dead. Otherland is a sequence that contains many secrets, and Williams plays fair by unpacking all of them in the final book. 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.