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1921. The Proskuriv doctor Yakiv Rovner moves to the small village of Sutkivtsi by a whim of fate. However, mysteries and riddles find him even here, because soon a commissioner from the capital arrives in the village, who is very interested in the ruins of the local castle. Rumour has it that there is a secret underground passage under them. The commissioner arranges large-scale excavations. And not for nothing: there really is something under the ruins. But how did the commissioner know about it? Yakov can't believe it's just a coincidence. All this has something to do with the former owner of the village, Tadeusz Hrabianka, who is said to have possessed the treasure. Jacob Rovner begins his own investigation. And the deeper he digs into the ancient history of the Hrabianki family, the more dangerous the truth will be. After all, there, among the bones and secrets shrouded in cobwebs, is not just a treasure, but a powerful force that can change the course of world history...