Psychiatrist C.J. Arnold buys an abandoned mansion, which was built over hot sulfur pits, in order to set up a drug rehab center. He recruits a group of volunteers to help clean-up and renovate the large house. Almost immediately, C.J.'s wife, Dr. Caroline Arnold, starts sensing a strange and unusual presence that starts to manifest as a ghostly apparition. Soon thereafter, more strange and eerie things start to happen which start to agitate the volunteers, along with the resident dog.