Fox Felek and rabbit Tola live with their friends deep in the forest. When a huge lake suddenly appears in the area and their neighbor, owl Henio, disappears, the pair of forest friends set off on his trail to solve the mystery! Will they make it before the water floods the entire forest? Beaver, who lives in a clearing, is finishing work on his life's work - a huge dam in the middle of the forest. To create it, he cut down many trees and blocked local streams. The water poured out very quickly and a lake was created in the middle of the forest, thus waterlogging the houses of Felk, Tola and their friends. To make matters worse, it turned out that during the night the water took their neighbor Henio away! There is no time to lose - the forest companions set out to rescue him! When they meet Beaver on the way, they try to explain to him that putting a dam in this place was a bad idea. Unfortunately, the arrogant animal will not give up easily! Will the heroes manage to find their friend and save the forest from flooding?