Originally an interactive novel, brought to you on the web at high speed, it's ... Portal ...available on the web.

"Originally published as an interactive novel on computer disk in 1986, Portal is the story of an astronaut who returns to earth from a mysteriously aborted mission prematurely awakened from suspended animation. One hundred years have passed; animals and plants thrive, cities stand intact. Every human being however has disappeared.

With the help of a slowly-reviving computer network, the astronaut begins to piece together the events of the last century. He learns of the child prodigy Peter Devore, of a world orchestrated by stunning new technologies, and of Peter's race against time to unlock the secrets of the Portal."