This is book 6 in The Last Apprentice .

This book has been graded for interest at 10-13 years.

This book was published 2009 by Greenwillow Books .

Joseph Delaney used to be an English teacher, before becoming the best-selling author of the Spook's series, which has been published in 24 countries. The first book, The Spook's Apprentice, was turned into a major motion picture in 2015.