"By" Shirley Harrison. Were "these gruesome journal entries...the genuine work of the notorious serial killer," "or a remarkably clever hoax"? Most modern commentators seem to think it's the latter, but you can decide for yourself...
...with a visibly used but cromulent PB. A sticker ghost on the back, a cracked spine (though it sits nice and straight), shelfwear and nicks, and a book-fair stamp along the page edges. Clean inside, though; a fine reading copy.