I love discovering science fiction reads that make me think while telling a good story, and Kress did a fine job with An Alien Light This made me think of Le Guins's work (quite a compliment) as it fits somewhat neatly into sociological science fiction with an alien component. Many generations ago, a human ship crashed (or something) on the planet Qom, and from the ashes two rival cities or states emerged on the mainland (the wreckage of the ship, still around, may be found on an island off the coast). Each of the two human societies over time created their own institutional framework around just about everything, including a dearth of high tech stuff; they are basically barbarous laced with some craftspeople who make glass, etc.
Qom possesses a harsh climate, with 'three day' days and nights, which vary from hot to freezing, and the indigenous flora and and fauna pretty hostile. The planet itself, however, remains secondary to the actual story. It seems humanity and the Ged, an alien species, have been at war for a long time, and surprisingly to the Ged, humanity is winning. What makes it so surprising concerns how humanity, alone among star-faring races, still fights among itself; humans are not united and violence common. Every other race with such tendencies managed to blow themselves up and/or their home planet before reaching the stars. What is it about humanity?
Well, the Ged decided to experiment on the forgotten planet of Qom to find out what makes humans tick. They build a 'city', a massive walled compound, and after about a year, it started letting humans in; they had to pass some tests to enter and stay, but some emerged early with valuable gems and other goodies, attracting people from both human 'tribes'. After about 600 humans 'pass' and enter the city, the city walls seal themselves and the story really takes off. An Alien Light features two protagonists, Ayrys, a glass-blower exile from one tribe, who makes for the city as she has nowhere else to go, and Jehane, a young 'sister-warrior' from the other tribe, who meet several days outside of the city while they make their way there.
The Ged provide food and lodging and the city is completely climate controlled; the Ged themselves, methane breathers, interact with the humans in special environmental suits. All they ask of the humans is that they go to 'teaching' several hours a day, and at the end of a year, they will all be awarded new weapons and other cool stuff. Each tribe quickly organizes itself, dividing themselves into separate lodgings and so forth, but must intermingle in the teaching lodges, much to their respective chagrin. What the Ged want comes out in orts and scraps, along with short chapters where we learn more about the aliens. Each tribe wants the goodies, as if only one tribe gets it, the other will be at a disadvantage when they all leave.
Kress does an excellent job exploring the socio-dynamics of each tribe and they differ in fundamental ways. The two tribes war almost constantly between themselves as land and other resources are quite scarce. I will forego details here, along with the plot, as all of that unfolding is what really makes this book work so well. The pacing at times ebbed a bit slow, but Kress' prose pulled the story along nicely. Even though this was first published back in 1988, it does not feel dated at all; it helps in this regard that the focus falls upon the sociology of each tribe rather than the tech. Solid read for sure, and if you like Le Guin's work, you will probably dig this. 4 alien stars!!