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From the publisher:

"Saint" Olga, it turns out, is not considered a saint by everyone. She is still cursed in Polissya, by the descendants of the Drevlyans, the same ones that the princess burned down together with the city - this is the paradox that the little characters of Princess Olha and Me face. How can one remember something that happened a thousand years ago? Is revenge appropriate for a "holy" princess? Or maybe the Drevlyans were right when they killed her husband, the racketeer and glutton Igor? Or was it not about him, but about the usual competition between Kyiv and Iskorosten? These are not childish problems that young investigators have to investigate while travelling to Polissia, the place where those ancient bloody events took place, reading books and looking at the Internet.