Rumor has it that the woods in River Heights Park are haunted! There have been eerie noises and unexplained lights coming from there lately. At first Nancy doesn't believe it, but when some girls from school, and even her own puppy, Chocolate Chip, start acting strangely, Nancy knows she has some investigating to do. What's worse is that while Nancy struggles to figure out this puzzle, Bess is terrified! Will Nancy get to the bottom of this case before they are all spooked out?