Aida Plakhovna Mamszelkina, a hardworking old woman with a scythe in her hands, commits a serious offense in an official capacity to help Mefodiy and his friends escape the wrath of the head of the Office of Darkness—the dwarf Ligul. The world of lunkheads is vast, but there’s nowhere to hide in it. Eden and Tartarus are out as well: the students of darkness don’t deserve Eden, and there’s no reason to hurry to Tartarus! There remains only one place where Mefodiy and his company won’t immediately think to look… Bald Mountain. And, besides, Mamszelkina advised the kids to learn the secret of Ligul. They say that in his youth the hunchbacked dwarf spent several years on Bald Mountain and came to hate this extreme place with a passion. Meanwhile, Ligul searches for the Path Stone, which will give him perseverance, strength, and the will to reach the ultimate goal—becoming the ruler of darkness…