'Tis the season for scary stories--and boy do we have lots of them! These books by Alvin Schwartz might be just what you're looking for as we go into Halloween weekend:
Ghosts!: Ghostly Tales from Folklore [E SCH].
In a Dark, Dark Room, and Other Scary Stories [E SCH]. This title, and the one above, a written for the beginning reader, so they have just enough scary tingle for early elementary school kids.
Scary Stories to Tell in the Dark [J 398.2 SCH]. This, and the two companion books, More Scary Stories to Tell in the Dark, and Scary Stories 3: More Tales to Chill Your Bones, are classics for children.
Here's an idea--if you have a scary story fan who's nine or older, than rather than fill his/her Halloween bag with candy, consider a subscription to Crow Toes Quarterly! (Can be purchased either in paper or e-zine formats.)