HarperCollins 03 January 2006 ISBN 978-0007210923 UK£5.99 PB
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Philomel Books 05 April 2007 ISBN 0399247254 US$16.99 HC
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Random House 03 August 2009 ISBN 978-3570306000 €9.95 PB
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Puffin Books 01 May 2008 ISBN 978-0142411797 US$7.99 PB