Currently reading a book called Unravelling Oliver and I already know it will stay with me; the writing is fantastic but the subject matter is surrounding domestic violence. A powerful read so far.
Another book was The Girl Next Door by Jack Ketchum. Based on the murder of Sylvia Likens in the 1960s (don't Google if you are easily upset).
So AIBU to ask, what is a book that has stayed with you and why?
Any recommendations (I enjoy controversial books in particular) would be greatly appreciated too.