Eleven-year-old Jon Whitcroft never expected to enjoy boarding school. He never expected to be confronted by a pack of vengeful ghosts either. And then he meets Ella, a quirky new friend with a taste for adventure...

Together, Jon and Ella must work to uncover the secrets of a centuries-old murder, while being haunted by ghosts intent on revenge. So when Jon summons the ghost of the late knight Longspee for his protection, there's just one question - can Longspee really be trusted? A thrilling tale of bravery, friendship - and ghosts!

There are 352 pages in this book. This book was published 2013 by Hachette Children's Group .

Cornelia Funke is a critically acclaimed, award-winning, international best-selling author. She lives in Hamburg with her husband and two children.