Thomas is the seventh son of a seventh son which means that he is destined to become a Spook - a man whose job is to fight ghosts, demons and spirits. He becomes an apprentice to a Spook at the age of 12 and begins to learn how to communicate with the various spirits bothering the people all around the countryside. But when he is left alone at the Spook's house for a week he makes a big mistake and is accidentally persuaded to release a powerful witch, Mother Malkin. He believes that he has defeated her but doesn't realize that killing her just amplifies her powers and now he must protect his family from her as she tried to find a way back into the world. A scary, compelling book!