Called to Cook County hospital to deal with an enraged ghost, Harry Dresden, Chicago's resident wizard, is puzzled and disturbed not by the ghost's wrath but by the fact that someone had cast a torture spell on it, goading it into action. Harry's disturbance increases when he discovers that the same spell has been cast on one of his friends. Harry begins to realize that he and his friends may be targets of a vengeful spirit, and as he desperately...