Meg Rosoff's Third Book.

From the Scotsman:

MEG Rosoff won the Guardian Children's Fiction Prize for her first novel and the Carnegie Medal for her second. With these accolades to her name, Rosoff's third novel has been much anticipated, and she doesn't disappoint.

And it'll be available in the States... when?

[Two minutes later:  Ah.  Yes.  2008.  When in doubt, check the author's website, dummy.]