Varley’s Big Dumb Object story, and the first in his Gaea trilogy. The first expedition to the Saturn System encounters an enormous spinning habitat (Gaea). As they approach, the ship is captured and destroyed. Some undetermined amount of time later, the expedition members, including Cirocco Jones, the Captain, emerge quite literally from the ground at various points on the outer rim of the habitat. They have all changed somehow, some having acquired new skills (such as being able to talk to some of the denizens of Gaea), some being depressed, some introverted. Cirocco Jones and what for all intents and purposes is her sidekick, Gaby, set off on a quest towards the center of the habitat to find some answers. Since Gaea is spinning, the center is “upwards” in their frame of reference.
A common misconception about this book is that it book is fantasy. It certainly does have some fantasy tropes, but is firmly in the science fiction section. The world building is ingenious and entertaining. Varley is excellent at characters and character interation, and so his Gaea, not unexpectedly, serves as the backdrop for character development and conflict. The ending is, as usual with Varley, both somewhat unexpected and viscerally satisfiying, even if in this case it also has to serve as a setup for the next two books in the trilogy. All in all a good read, but not stellar Varley.