This story happened a long time ago, when people did not yet know how to build houses and used only stone and wooden tools. That time was called the Stone Age. On the banks of a large river lived ancient people who called themselves the Wise Beaver tribe. People considered this animal their patron, but they did not dare to call him by name so that he would not get angry. They called him Master of the River. In the tribe lived the boy Kamysh and the girl Golden Shadow, who really liked each other. And once they got lost in a remote dense forest, and there was nowhere to wait for help. The forest in those distant times was filled with wild animals, and at every step of the children there was a danger. Only courage and friendship could help the young heroes survive and return home.