The new transfer student Jeanette Ellevan is a genius at creating spells and teaches classes on the subject. She has a secret or rather many secrets. She is the worst magical taboo to come into existence. Hermione is forced to work with three Slytherin's—Jeanette, Draco, and Theodore—on a yearlong Arithmancy project and learns a lot more about Slytherins' than she can handle. As..