Containsmorethan600entriesaboutghosts,hauntings,relatedparanormalphenomenon,thepeoplewhoinvestigatethem,andthekeytheoriesaboutwhatcausesthem.Thisencyclopediacompilesresearchontheavailabletheoriesaboutwhatcausesghosts.Italsoincludesblack-and-whitephotographs,andabibliographicallistingforfurtherreading.