It took me a couple of days to think about this novel, before I could actually formulate my thoughts. Shades of Lok, our Neanderthal protagonist.
The novel is a brilliant exercise in reading. As the narrative advances, it requires that we develop the patience, endurance, and perhaps even tolerance, to recognize the existence and validity of a view point that is "other" to us, even when we are unable to grasp this perspective, or translate it to our language. That makes for a very challenging, at times frustrating, and ultimately, a most worthwhile read.
The historical truth is really not important here. We, as readers, see only what Lok, the Neanderthal, sees, hear and sense only what he hears and senses, and are able to capture and understand only that which is within his grasp. That is the frustrating part. There are pages upon pages of descriptions of Nature and of the "new people," who we know to be the rising homo sapiens, and there were many passages in which I felt I had no idea what Lok was talking about.
Lok and his people are endowed with a very high level of sensory perception, and despite their minimal language skills, they communicate telepathically, a skill considered in our day and age, as exceeding that of language. Their perception of the world is through pictures and there is no language barrier to their telepathic communal sharing of these pictures. So who is backwards here, the new people (us, homo sapiens), or the doomed Neanderthals? As we know, the answer to that question is unimportant; the only relevant question is which of these people will be the fittest for survival.
Juxtaposed with the Neanderthals are the new people who are constantly talking, and communicating as we do to this day- through the symbols of language. Lok's people share the "thing" itself, whereas the new people use a language symbol to describe that same "thing". Their language is their strength. Their language empowers them to initiate, to think abstractly and to develop new skills. Lok's people are only able to do what has always been done. The new people have agency, and that is their evolutionary leap.
The novel's plot is simple; the challenge, as a reader, is to constantly inhabit Lok's perception, whilst being unable to comprehend, as he is unable to comprehend, most of what he encounters with the new people. Being homo sapiens we do finally understand that the bent stick and the straight sticks perceived at first as gifts from the new people, are bows and arrows being used against them, but unless I read the novel again, some of the descriptions will remain unfathomable to me, as they were to Lok.
The story takes place on a ridge (if I understand Lok's descriptions correctly, not sure of that), near a waterfall, and the novel has an abundance of biblical "Fall" metaphors. The Neanderthals are portrayed as a pre-Fall people, innocent and unaware, and the homo sapiens as post-Fall People who have awareness and knowledge. I am less a fan of these metaphors.
It is only in the last chapter that the perspective changes and we are given the new people's perspective. With their failings, their cruelty and their subjugation of nature, they also have language, they have tools, and they have agency. Despite the biblical metaphors, they, the bold, will rise and inherit the earth, whilst the meek and innocent will disappear.