What would you think if you received an email from Azazel, the angel of death? Somebody's stupid joke! So Ulyana Osipova thought the same. But when two of her colleagues died, having received the same message, she realized that it was - alas! - not a joke. Someone is cleverly manipulating her, pursuing their clearly evil goals. Ulyana had to delve into history, learn about the existence of the “Fifth Gospel”, see the corpse of a man walled up in the wall, and... not get any closer to solving Azazel. It seems that she is doomed to serve the evil spirit. And then her guardian angel appears, who, by the way, is a very handsome young man. But this makes the situation even more confusing...