The heroes of the adventure story by the famous children's writer, winner of several literary awards Tamara Kryukova Petka and Dasha, having arrived in the village for the summer with their grandmother, learn that the Witch's swamp was a healing lake in the old days. Children dream of ridding the enchanted spring of its spell, but to do this they need to make a dangerous journey through the Valley of Mirages and the Kingdom of Shadows, where they meet mythological characters: terrible wolf-people - wolfhounds, treacherous old bird-women - goddesses, beautiful mermaids-beregins, brave warriors, blazhins, unpredictable Anchutka...