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No idea about contemporary English literature to be honest.Swedish novels are usually the sort of detective/ crime novel that is likely to sport a serial killer of some sort but I doubt they get translated much
I haven't read the books themselves, but the TV series Dexter is based off of a series of books. If they're anything like the show, they'd be phenomenal.
Nothing gnarly comes to mind, Seven Arts Brah. What you're talking about isn't a protagonist that's very common. You barely ever see it in games and TV, let alone novels. The problem being if you ask somebody about it they'll think you're a mondo evil person yourself or just plain creepy.