In the far future when Thousandth Night is set in, humankind has advanced to the point where almost anything is possible: living for hundreds of thousands of years, travelling across the galaxy, and transforming the structure of the human body to almost any form. One thing that is not possible is breaking the laws of physics by travelling or communicating faster than the speed of light.
One group of humans, the Gentian line, meets every few thousand years. For 999 days each member shares his or her experiences from travelling through the galaxy. Then on the thousandth night, they elect the member with the most entertaining presentation to prepare the next reunion.
Reynolds introduces together a number of space opera technologies on the framework of a mystery during one Gentian reunion. He later reused these technologies in the setting for another novel, House of Suns. Although the big science fiction ideas are the star, Reynolds never loses sight of the effects of science on humans. In fact, one of the major themes of the novella is our efforts change the physical world around us and the long-term consequences, good and bad, of those actions.