At the foot of the brewing waters of Murchidson Falls in Uganda live two eternal enemies: the monitor lizard and the Nile crocodile. The first has become master of the banks where he seizes the eggs of the second... who reigns terror in the river. The first days of the Nile crocodile are a succession of nightmares: if he resists the onslaught of the monitor lizards, the young crocodile will have to dodge the attacks of perches and other fish eagles. Growing up, he will become the undisputed master of the river, and will try to swallow up his enemies of yesterday.