Horror tales produce fear in readers. Horror features nightmares come to life, complete with the monsters -- human, inhuman and psychological -- which inhabit our worst fears. As in nightmares, surprise is a key element. We never know when these monsters will invade our lives, and unease and foreboding drive the story as we await the unexpected. The key to horror is that although the evil may be beaten down. It is never destroyed completely and it lurks just beneath the surface, waiting to emerge again.