What is a supernatural story?
it is not real it is imaginations
The story in which the content is about the things which can not be defined by modern science is the supernatural stories.In these stories,writer describes such things which are above nature and nature's laws,such as soul,ghost,etc.
A supernatural story is the one exploring the ideas and the heights of imaginations of an author about supernatural things and activities.
e.g., in Macbeth , the concept of witches by Shakespeare and then Lord of the rings by J.R.R.Tolkien,a high fantasy epic.