We tend to take for granted that all narrators are unreliable, but I had never read a book where this is so flagrant. All your attempts to pin Engleby, the character, down will be fruitless because even when you think you are seeing him from another person’s perspective, you are actually just having access to his reading of someone else’s view. You cannot trust anything that comes from his pen or his mind. Sebastian Faulks managed to create one of the most slippery minds in literature, as far as I know. Also because when you finally think you got it, he pulls the carpet from under your feet right on the last page. Highly disturbing but brilliant!
Faulks, S. (2007) Engleby. London: Vintage.