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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, but not an ordinary one. Lelechenko, like his father, is a chemist. Once, before the Midsummer holiday, Petrus had an incredible adventure: he found a magic fern flower, saved the world and his life. He also discovered that there is a land of invisible spirits and mysterious creatures beyond the boundaries of ordinary human existence.