seriously you should check these out.
if you've seen the film of american psycho it doesn't matter, the book is completely different. extremely fucked up, it was banned for a while, and still is in some countries. some people find it boring for most of it, but if you understand what Ellis is trying to do, i think it's a fantastic book.
The Wasp Factory is just as messed up, but completely different. it's gripping, extremely well written and has a brilliant story. i read it in about two days, i just couldn't put it down. the way Banks describes the settings and the story gives it an almost cinematic feel and the twist at the end makes it even more worth reading.
trainspotting is also really good if you can be bothered reading something written in Scot's dialect. again, even if you've seen the film it doesn't matter, there is so much more to the book. the way it is written is also very clever in that it doesn't have a set narrator throughout the book, but changes between the author and the various characters, to create a patchwork storyline that in the end all comes together. the use of Scot's dialect for the majority of the narration is also very effective as it forces you to become more connected with the characters and story. again i read it in about two days (although being from Scotland i found it pretty easy to understand haha)
these books aren't just sensationalist "messed up" books written purely to cause hype. they have well crafted storylines and the authors are well established literary figures, so there's no doubt they're highly regarded. would definitely recommend them!
(sorry i completely nerded out on this post haha)