An international bestseller and now a major motion picture.Keisha Ceylon is a psychic. At least, that's what she tells people. She watches the news for stories of missing people, then waits a few days and goes to see the family. She tells them she's had a vision and that she may know where their missing loved one is--for a price, of course.    Keisha's latest mark is Wendell Garfield, whose wife disappeared a week ago. She's seen him on TV, pleading for his wife to come home,