How To Write A Slasher Story . When you see these elements laid. The parents are walking with their two children, a daughter and a son. How to write your best SCARY story! Oxford Education Blog from educationblog.oup.com Tap into common fears the most important part of any horror story is naturally going to be its fear factor. The little boy trips and falls into a dark river. The more convincingly they can convey the experience, the more successful they’ll be in striking fear into the hearts of their readers later on.