Although I believe Halloween is more than just “scary”, fear is a large part of Halloween, and I think it can be a real challenge to find good scary stories (recognizing that good is a very subjective thing).
1. Isolating the story to a single location.
Most of the time this amounts to isolating or trapping multiple characters in a single location, which was already covered in Characters #3, focusing on characters in the same location.
Some stories are told from a single perspective, in a single location, over a short span of time (for example, Emperor’s Soul by Brandon Sanderson), but in general, the longer a story is, the more complex it becomes. Most novels feature between 2 and 6 different point of view characters, each with their own cast of supporting characters. They engage multiple narrative threads, spanning a wide range of locations and moments in time.
Background information is a tricky aspect of storytelling. Background information is one or more details that don’t seem relevant or important in the moment, but as the story progresses audiences work to collect and combine the different pieces of background information, gradually developing a greater understanding of who a character is.