The Secret of the Black Mountain, or Holidays in Chudesatovo

Three friends, Shurik, Lyolik, and Tusya, are spending their long-awaited summer holidays in a village. One day, the kids accidentally find out that there is a real treasure hidden in the forest near the village. Among the locals, there have long been legends about a forest spirit who guards this treasure, and about all sorts of malevolent creatures inhabiting the forest. Additionally, there lives a sorceress in the village, whom the children consider an evil witch. Tusya's grandmother tells that the sorceress's father was a partisan during the war and went missing. Soon, the kids find themselves in the middle of an adventure searching for the treasure, filled with a considerable amount of humor and mysticism. The chain of events leads to the kids getting lost and accidentally finding not the treasure, but a much more valuable treasure.