John Gregory, a seventh son of a seventh son and also the local demons, has protected the country from the witches, boggarts, demons and all things that go bump in the night. But John is not young anymore, and was looking for an apprentice to carry on their trade. Most failed to survive. The last hope is an agricultural dan'tre son named Thomas Ward. he will survive the training to become the devil that so many others could not? Should he trust girls with pointy shoes? How Thomas could stand a chance against Mother Malkin, the most dangerous witch in the county?