6 Most Depraved, Gruesome, and Violent Books Ever Written. Dec 21, 2014 by whytoread in Horror Books. The books on this list are disturbing and unsettling. There is no winning when you read a book like this. If you donât finish it, youâll lose out, and if you do finish it, youâll feel like youâve lost. But, whatever doesnât kill you surely makes you stronger. So without further ado, here are the most depraved, gruesome, and violent books ever written.