I was suprised to find that this was as yet unreviewed. C.J Cherryh has been one of my favorite authors for many years and I re-read her books on a regular basis.
This is the sequel to "Rider at the Gate" where the main protagonists were first introduced. However the book can and does stand by itself (the blurb on the back is helpful). The story is set on frontier-like colony in the late fall as true winter approaches. Humans are struggling to survive poor weather and telepathic predators and scavengers. Contact between villages is only possible if Riders act as guides and protectors. Each Rider has bonded with a nighthorse, one of the few alien lifeforms that humanity has befriended.
The start is typically slow, a young rider Danny and his nighthorse Cloud are trying to escort three orphaned children to the next village through a blizzard. Danny and Cloud do reach their goal with no major mishap and are able to deliver the children to the none-too-tender care of the village authorities, while he and Cloud are stabled with thw village's own Riders. However trouble has followed them up the mountain. The children are survivors of another village destroyed by a swarm of vermin, scavengers and an unknown predator that had been able to enter a heavily guarded gate. In addition the children are haunted in their dreams by a rogue nighthorse looking for a replacement Rider.
As the tale unfolds, the reader is submerged into the world. CJ Cherryh's narrative is like "surround-sound" for the mind; the pictures she paints and the images that she creates are so vivid that it is easy to lose all sense of time and find oneself reading avidly at three a.m. She depicts characters with an elegance of style that makes her dialogue all too easy to hear as you read.
If you have never read her books before, they ARE worth the effort,but they can take time to tune into. This is possibly not the best to start on (try one of the Chanur series), but it one that I keep coming back to , time and again.