The Vampire Mystery (Boxcar Children)

The Aldens meet Mr. Hudson, a local author who is best known for his novel about a vampire. But rumors of a real vampire are going around town - a vampire who haunts the graveyard behind Mr. Hudson's house! But since vampires don't exist, the children soon realize that someone must be trying to scare people away from Greenfield! Who brought the old legend back to life - and why?