The gut-wrenching angle = "Its been 2 weeks.He's due another.He may even have a live child with him right now, who's moments away from being left like this one."(mutilated+killed 53+)NON-FICTION/TRUE-CRIME.
Of course there are gory visuals thru-out.But the psychological context given to the deeds, is terrifying.
The police are followed (via fieldwork and paperwork)thru their horror of what they keep coming across, and their desperation of having no clue how to make use of it.
Their are endless mess-ups and frame-ups leading to unforgivable injustices to innocents, and close-calls with the killer.One incident will make you violently livid toward those who let him to the streets again, inspite of the most blatantly damning behaviour imaginable.
The 'confession'(at end of book)in the killer's own words, is amazing in that it gives his angle of scenes dealt with from the 'unknower's' angle thru-out the rest of the book.He himself knew that at least 30 of his kills should never have seen possibility.
Some chapters are far too incidental.(some would rightfully drop it a star for that)But, most of it just makes your heart drop - at the deep suffering of an unknown man, being such that he is always losing against his froes of deep rage, so ruining children beyond recognition.
(bonus in this book=u get great feel for the harsh everyday life in Russian society)