The story is about a present-day boy who has vivid dreams of a past life as a primitive human, living in an…

The story is about a present-day boy who has vivid dreams of a past life as a primitive human, living in an era when humans (something between primates and what they are today) were still developing and were constantly facing threats from predators. He dreams of being a member of a group of humans who were divided by species and competed with each other for territory and survival.