The end of civilization has arrived. It is not known what caused the cataclysm. A Father and his Son are among the few survivors. The Son grows up like a wild beast, because the Father thinks this is the only way he can help his child survive in a world where human relationships have become extremely dangerous. When the Father dies, the Son decides to undertake a journey beyond the confines of the sluice and the reservoir, along a mysterious river, moved by the desire to discover the world that was forbidden to him, but above all in search of someone who can read the words written by The Father in a notebook.