There are 4 books in the Otherland series. The newest book is Sea of Silver Light which came out in 2001.

1
City of Golden Shadow

Book cover of City of Golden Shadow
Otherland is a universe ruled by Earth's wealthiest and most ruthless power-brokers, The Grail Brotherhood. Surrounded by secrecy, incredible amounts of money have been lavished on it and two generations have laboured to build it. Now it is claiming Earth's most valuable resource - its children.
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2
River of Blue Fire

River of Blue Fire
Second book in New York Times-bestselling author Tad Williams's cyberpunk fantasy series * "Tad Williams is the brightest and best of the fantasists." Neil Gaiman, author of American Gods

Otherland. In many ways it is humankind's most stunning achievement: a private, multidimensional universe built over two generations by the greatest…

3
Mountain of Black Glass

Mountain of Black Glass
The third book in New York Times-bestselling author Tad Williams's cyberpunk fantasy series * "Tad Williams is the brightest and best of the fantasists." Neil Gaiman, author of American Gods

"The Grail Brotherhood has built the most powerful, sophisticated simulation network imaginable. At the same time, they have manipulated and…

4
Sea of Silver Light

Book cover of Sea of Silver Light
Now in trade paperback, the fourth and final book in the classic, genre-bending cyberpunk Otherland quartet from a master fantasist.

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…