Attack Of The Fiend (The Last Apprentice, Bk. 4)

A new danger is threatening the world of Tom Ward, the Spook's apprentice. For more than a year he has learned to banish bogarts and drive away ghosts, but now the three most powerful witch clans are uniting to unleash an unimaginable evil. Tom and the Spook set out to stop them, but when Tom finds himself on his own, will he have the courage and cunning to defeat the most powerful enemy he's ever encountered?