He hates vampires, but is forced to save these damned creatures. Having first encountered the Fiends of the Night in the mountains of Chechnya, where he was a military doctor in an airborne assault battalion, he became convinced that the ghouls could not be defeated in open battle - only in a secret war. Returning to his native St. Petersburg, the former field surgeon opens a “midnight clinic”, where he not only treats bloodsuckers, but studies their physiology and biochemistry... Will Doctor Blood be able to unravel the main mystery of the night killers - the secret of their hemoglobin? What sacrifices, what crimes will he make in order to find the “Achilles heel” of the most terrible enemy of the human race since the beginning of time? And does this holy goal justify the terrible means to which he has to resort?