In a tumbledown castle in the Western Highlands of Scotland lives the Boggart. He is invisible -- an ancient mischievous spirit, solitary and sly, born of a magic as old as the rocks and the waves. He has lived in Castle Keep for centuries, playing tricks on the owners. But the last Scottish owner has died and left the castle to his great-nephew Robert Volnik of Toronto, Canada. The Volnik family -- including Emily and her nine-year-old computer genius...