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The Polish girl Eva and her brothers live in nineteenth-century Vilna. One day, their father announces that he has bought an estate with a whole village in the Ukrainian Polissya. The move brings more adventures and complicated questions to their lives. For example, how did it happen that some people belong to others, and is serfdom equal to slavery? The young heroes of the book learn about local customs, cultural and religious diversity, comprehend social inequality and human dignity, and experience the meeting of two worlds: the old gentry and technological and ideological progress. And they also unravel the mystery of the legendary Mamai, which has its roots in the Cossack history of the region.