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Petrus Lelechenko lives in a modest hut on the outskirts of the village near the forest. He is a boy like any other, he has a mother and an aunt, and his father went with the Cossacks to rescue prisoners from Turkish captivity five years ago, and has not been seen since. But suddenly everything changes for Petrus: he sees a housekeeper walking in front of him, his kirpa held high! And it turns out that beyond the boundaries of ordinary human life there is a land of invisible spirits and mysterious creatures, where the boy is lured by a magical song, because it is up to him to find the fern flower and change the world forever. The evil and ruthless army of the black goddess Mara stands against Petro. The fate of the gods and life itself depend on the courage of the twelve-year-old boy, as well as on the skill and wisdom of his new friends: Dream, Osprey, Live, and Shear.