"Well written "good" books create worlds and characters you don't want to leave. Dark and disturbing books create worlds so disgusting and inhuman that all you can ever think about is how to escape them.
In what might be an ironic twist of fate, it's the dark and disturbing books that teach one to be optimistic. No matter how bad your life is, at least you aren't eaten from the inside out by hungry rats.
The list below contains some of the most depraved, violent, creepy, and disgusting books ever written. You'll feel the need to throw them at the wall, you'll feel something that conventional "good" books can't really transmit, at least not at the same intensity."
Credit goes to hastyreader.com and their respected authors
https://hastyreader.com/dark-disturbing-books/