HarperCollins
03 January 2006
ISBN 978-0007210923
UK£5.99 PB

Amazon.co.uk
Play.com



Philomel Books
05 April 2007
ISBN 0399247254
US$16.99 HC

Amazon.com


 


Random House
03 August 2009
ISBN 978-3570306000
€9.95 PB

Amazon.de


Puffin Books
01 May 2008
ISBN 978-0142411797
US$7.99 PB

Amazon.com


Also available as a downloadable audiobook from
Audible.com