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1913. The fierce battles between humans and the undead are in the past, and former enemies have learned to live side by side in Kyiv, the main city of the Boundary. But this peace is illusory, and violence is about to break out. The ancient prophecies are inexorable - someone will come who will change everything and pay full retribution for injustice and oppression. Against his will, Alexander Tyurin, a famous detective who has his own reasons for avoiding Kyiv, finds himself in the middle of the action. Six detective puzzles, bloody crimes, political intrigue, the pain and joy of love, the secrets of holy places and the call of ancient forces. In search of the truth, family secrets are revealed and buried history is resurrected. The heart leads through the darkness to the goal, but will the last seal be opened to make the prophecy come true? Will Alexander Petrovich Tyurin be able to pass through his personal purgatory and prevent a new war?