(From the publisher):
Stranded on a fertile, ore-rich planet, human colonists appear to be in paradise, but unseen horrors threaten their survival. All the native animals communicate by telepathy, projecting images which drive the humans mad. Only Nighthorses, who can form telepathic bonds with their human riders, stand between civilization and insanity.
Original title: Rider at the Gate
Genre: Fiction→ Science Fiction→ Adventure→ Planetary Exploration and Colonization
Fiction→ Science Fiction→ Alien Beings→ First Contact