Disturbing Books ?

What would you name as the most disturbing books you've read..

For me it'd have to : Anything by Peter Sotos, De Sade, American Psycho by Bret Easton Ellis



 What about you ?

Definetly "The Shoemaker"

Its a true story about a guy who goes insane after a horrible child hood and attempts to find a way to rape and kill 3 billion people to become god...