In a small village, in a modest cottage, lived a mother with her three sons. Each of them was different. The eldest stood out for his strength and beauty, the middle one for his knowledge, and the youngest for his love of nature. Everyone made fun of the youngest. Once, they sent Jędrek to a nearby forest called the Black Forest. There, the young man met a dangerous sorcerer who was holding a beautiful princess captive on Glass Mountain. Upon returning home, Jędrek shared this news with his loved ones. The brothers decided to defeat the evil sorcerer and free the princess, but each of them had a different goal in mind.