I died, respected professor of anthropology—and woke up in the body of an anonymous young man in the middle of a tundra steppe, surrounded by cave hyenas. Around me lies a harsh, primeval world of the last Ice Age. And in my head—lies the entire future history of mankind: its breakthroughs, its dead ends.
But no matter what knowledge I possess, it is spear and instinct that rule here. And for me to be heard, I must first earn a place by the fire. Only then will I be able to begin my real work: step by step, unnoticed by those around me, I will change the path of an entire species.