There is such work—to defend people from the unclean. Nikolai Dergunov serves in Moscow’s OBKhSS, the Department for Combating Chaos, Beings, and Entities. All sorts of nasties have multiplied endlessly: unquiet corpses, larva, demons, succubi. They enter our world through adapters—mirrors, cemeteries, train stations. Or sometimes a person, a fool, decides to secure the support of a demon for himself without knowing what price he will pay for it. And then the OBKhSS staff has to clean up the mess!
In Nikolai’s life, besides this heavy thankless work, it seems like there was nothing else—after his wife, Nina, mysteriously died. But when ominous crimes from beyond begin to happen one after another, Nikolai himself finds himself on the threshold of death. Now he must unravel a mystical puzzle, uncover the secrets of his own past, and save Moscow from catastrophe…