It's a bit difficult to recommend further reading! The junior horror market may well be overheated and terribly crowded, but few do it quite like Shan. They might like [[Changeling by Steve Feasey]], which has a little bit more contemporary glamour, or [[Skulduggery Pleasant by Derek Landy]], which has a lot more wisecracking. For pure gore, I'd recommend [[The Dead (The Dark) by David Gatward|The Dead by David Gatward]].