I read Frances Hardinge's Gullstruck Island (US title: The Lost Conspiracy) slowly, which was the fault of circumstances rather than that of the book. It's probably an 11+ YA, and there's nothing very edgy about it (though a village gets massacred early on). I do wonder if this might have been published as an adult book if the author wasn't a prize-winning children's writer (Branford Boase Award for her first novel, Fly by Night) and the chief protagonist wasn't thirteen years old. It would probably take a pretty sophisticated younger reader to get through this - complex plot, a high wordcount (130,000) and absolutely no talking down to the reader (something I think Garry Kilworth faltered with in places in The Hundred-Towered City, the previous book I read). There's no doubt that Hardinge has a fine ear for language, and the worldbuilding is satisfyingly detailed. The novel is a little slow to start, but I enjoyed it quite a bit. I'd like to read her previous two novels - the second one is Verdigris Deep (Well Witched in the US).
After four fantasy novels on the trot, all over 90,000 words, I'm having a change of pace by reading two shorter realist adult novels. One of them is Jennifer Johnston's latest (Truth or Fiction) and she's long been a favourite author of mine. Then it's on to GRRM's A Feast for Crows, and that will definitely carry me through to the end of the year. So my YA reading for 2009 is very likely at an end, though I have quite a pile set aside for 2010.