Mystery of the Witch Who Wouldn't — Kin Platt

Take a white witch named Aurelia Hepburn who can cast spells, raise storms, summon demons, predict the future, and read minds; add a scientist working in ultra-sonics and a band of very determined black magicians who want to learn his secret invention at all costs; throw in an equally determined and inquisitive young man named Steve, and his English bulldog, Sinbad; put them all on an abandoned island off Hampton, Long Island, and you've got a humorous, spell-binding adventure, by the winner of the Mystery Writers of America Award for best juvenile fiction.