Grandpa teaches Zete and Rika the well-known symbols of the Transylvanian gates and their meaning. The kids learn about the resourceful, crafty, and unique people who still live here, surrounded by the extraordinary and awe-inspiring landscape. Grandpa tells Zete and Rika about the strange noises coming from Single Stone Mountain. According to the local legend, the Devil is tied to the mountain with a binding agreement. After listening to Grandpa's tale, the kids secretly set off to discover the cause of the mysterious roar. A glowing horseshoe falls from the mountain...