I loved the world of this book: January, a planet tidally locked to its sun with one side frozen in perpetual night, the other burning and bright. The humans who colonized this planet many generations ago established several cities in the narrow band of dusk between the two extremes. They were aware of the native species, but they didn't understand the intelligence or careful climate control programs the indigenous beings had crafted to keep the world livable- until those systems started to break down under human intervention. I struggled to like the characters who fill this intriguing setting. I think for me the book was a little too long, and some of the emotional beats didn't land. I would have liked more of the January beings, more explicit queerness, and less of the painfully disintegrating friendship. I believe this book has been optioned for TV- I'm curious to see what changes might be made in an adaptation.