"The Key to the Kalevala" by Pekka Ervast is a fascinating study of the Finnish epic, in which the author reveals the secrets of ancient folklore. The book tells the story of the creation of the "Kalevala" Kaleva by Elias Lonnroth, who collected and arranged Finnish folk songs, thus creating one of the most important literary works of Finland. The author reveals the symbolism and meaning of each poem of the Kalevala, helping the reader to better understand the spiritual heritage of the Finnish people. This book is indispensable for those interested in Finnish mythology and literature, as well as for connoisseurs of cultural analysis.