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In Upper Paleolithic Europe 20,000 years ago, a small tribe of hunter-gatherers prepare for a hunting expedition to hunt for the coming winter's food. Tau, its chief, trains his teenage son Keda, accepting him and Keda's friend Kappa to join the hunting party. His wife Rho worries that Keda is not ready, but Tau believes he is and the hunters set out.

Tau tests Keda by having him kill a wild boar they've caught, but Keda hesitates. One night, the party's fire draws the attention of a large cave lion, which lunges through their circle, snatching Kappa before anyone can do anything. Hearing the fatal struggle in the darkness, the tribe gives him up for dead. Kappa is given a memorial service in the form of placing rocks to symbolize the passing of one's spirit to the afterlife.