But it's every serial killer's favourite book

Just took the book quiz, link courtesy of electrcspacegrl and got

( The Catcher in the Rye. )

The Haunter of the Dark, huh?

So which Great Old One am I? Turns out to be one that has ties to Australia (that's the cue for spooky music, I guess!)
( Nyarlathotep lurks here! )