The fundamental difference between the mystery story and the ghost story is the fact that a mystery demands a solution for its effectiveness; a ghost story is necessarily unsolvable; the reader must be willing to accept the fact that nothing is proved.
Bennett CerfThey tell about a fifteen-year-old boy in an orphans' home who had an incurable stutter. One Sunday the minister was detained and the boy volunteered to say the prayer in his stead. He did it perfectly, too, without a single stutter. Later he explained, "I don't stutter when I talk to God. He loves me."
Bennett Cerf