For more than half a century, the Franklin Castle's dark facade has lured curiosity seekers from around the world. Behind its iron gates, this Victorian-era structure harbors rumors of everything from insanity to mass murder. Disembodied voices echo from empty rooms, doors open and close of their own accord and cold spots drift about the manse. Witnesses swear to sightings of a woman in black and a young girl in white, believed to be the ghostly apparitions of the wife and daughter of the original owner, Hannes Tiedemann. Using previously unpublished photographs, interviews, family accounts,...