Guess What? Guess What? is a picture book for children, written by Mem Fox and illustrated by Vivienne Goodman, about an old woman, with various witchlike qualities. It was published in Australia in 1988 by Omnibus Books, and an American edition was published in 1990 by Harcourt Brace Jovanovich. The book has a steady phrasing, along the lines of:  The book's final twist reveals the old woman as a witch. "Guess What?" is on the American Library Association list of the 100 Most Frequently Challenged Books of 1990-2000 at number 66. The challenges to the book are generated because of the supposed occult connection since the book is leading the reader to develop a positive impression of a witch.