A brief introduction:
A Spook, as he is called by the people, is what we would normally call a warlock. His job is to deal with all the things that go bump in the night. Ghosts, ghouls, ghasts, witches, boggarts. He rids a place of these. Despite all the work he does, he is not welcome amongst the towns people so he lives in the outskirts. And lastly, he must be the Seventh Son of a Seventh Son. As only he has the gift to be able to see and not be fooled by all of these creatures of the dark.
The story is told by Thomas Ward, living with his parents and his six other brothers at a family farm. With his eldest already married and baby on the way, the house is becoming quite crowded. It is decided that Tom be an apprentice with the Spook, him being a seventh son.