Unfogging the Future is a book on the subject of divination, written by the celebrated Seer Cassandra Vablatsky and published by Rumiharts Books From at least 1993 onward, this book was a required textbook for students taking Divination Classes at Hogwarts School of Witchcraft and Wizardry. A copy of this book costs two galleons at the Flourish and Blotts Bookshop in Diagon Alley.