The Watcher by Nicholas P. Oakley.
Set in the far future, on the tribal world of Gaia, this debut science fiction novel tells the story of Tian, a young hunter struggling with loss of her childhood lover who disappeared under mysterious circumstances. When Tian’s tribe is threatened by violent slavers, she received help from a Watcher—a monstrous, mythical creature who is actually a genetically enhanced anthropologist from an advanced civilization. Through the juxtaposition of the precivilization tribes and the technologically advanced society of the Watchers, the novel explores themes of the role of ideology and tradition in daily life.
A good read with good characters. Likeable story. Slow but readable. 3*.

The premise of this one sounded really interesting, but the story never drew me in. I had trouble keeping track of what was going on, and I didn't finish the story. An interesting premise, but the execution of the concept just didn't work for me.