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1900, Kam'yanets. A young investigator is brutally murdered in the city centre. His body is completely exsanguinated. The townspeople close the shutters tighter and are afraid of the night. They say that it is an ancient horror that has returned. A surgeon from the county town of Proskuriv, Yakiv Rovner, arrives in Kamianets and finds himself in a whirlwind of mysterious events. The murders of the townspeople are somehow connected with the ancient tribes that settled on the Kamianets cliffs thousands of years ago. What happens makes Rovner, an ardent materialist, believe in the supernatural and reconsider his attitude to ancient legends. By a whim of fate, he finds himself drawn into a centuries-old conflict between two powerful families in order to uncover the ancient secret of the provincial Kamianets.