Before you even start to think about reading it, here comes the triggers (you should know before reading):
Stalking, female and male nudism, straight and gay Sex, choking, torture, hallucinations, forced suicide (?), mutilation, self-mutilation, dismemberment, lots of blood, use of chains, attack on/by family member, rape, murder, mental illness, general abuse, willing incapacitating others, general body fluids, heavy verbal depreciation, humiliation.
After knowing that you may find those and more, if you are still willing to read, I highly recommend i, since it is an actual thriller,it gets you on the edge, it's dark, scary, ducked up, but extremely well written and down. Depending on your personality you may not even hate none of the characters (I do not hate any, but I pity all with no exceptions)
Killing Stalking