During the Great Patriotic War, a Soviet scientist is captured. Under pain of death, he agrees to work in one of the secret laboratories of the Abwehr, which is engaged in research - Tibet. After the liberation of Germany from the Nazis in 1945, the scientist returns from captivity to his homeland, taking with him secret documents. And now one of the intelligence services begins to hunt for papers. By chance, a priest becomes a participant in this story. Embarking on the path of fighting against dark forces, he finds himself in his past life, in the eighteenth century, and finds himself in the City of Sin, the owner of which is none other than Satan himself. Murders, betrayals, here not a complete list of everything that the main character of the novel will face. Passing through the stages of the underworld, with the souls of sinners, Vladimir understands that this is not the end, but only the beginning of a great struggle that has no boundaries in the Universe.