This is book number 5 in the Last Apprentice series.
Thomas Ward has spent two years as the Spook's apprentice. He's faced unimaginable peril, and survived. But a new danger has emerged: an ancient water witch, Bloodeye, is roaming the County intent on destroying everything in her path. To strengthen his skills, Tom is sent to the far north to train with the demanding Bill Arkwright. Arkwright lives in a haunted mill on the edge of a treacherous marsh, and his training methods prove to be harsh and sometimes cruel. Will Tom's new bag of tricks be enough to overcome a critical mistake that leaves him confronting Bloodeye on his own?
Joseph DELANEY is the author of the internationally best-selling The Last Apprentice series, which is now a major motion picture, Seventh Son. He is a former English teacher who lives in the heart of boggart territory in Lancashire, England. His village has a boggart called the Hall Knocker, which was laid to rest under the step of a house near the church.