This could be used for a seasonal project or to follow a unit that covers Edgar Allan Poe, a mystery/detective/horror genre, or as a final assessment for a unit over plot elements! It can also be adapted to fit a variety of genres - not just mystery or "scary" stories.
The objective is to get students applying their knowledge of the elements of plot by creating their own narrative. This assignment requires then to write a scary story but challenges them to make it appropriate enough for a smaller child to read.
Project comes with a full description and rubric.