Suffering a nervous breakdown after her husband is murdered by the Pentagram Killer, actress Elizabeth York commits herself to the Abernathy Clinic hoping that Dr. Abernathy’s experimental therapy will soon have her restored to sanity. Unknown to Elizabeth, the sprawling mansion overlooking the Pacific Ocean was once home to Roland de Winter, the high priest of Hollywood’s most notorious Satanic coven. Now, it has been transformed by Dr. Clark Abernathy into a private sanitarium catering to the Hollywood elite.
But something evil lurks in the shadows of the Abernathy Clinic and Elizabeth is soon caught in a vortex of unexpected romance, séances, hallucinogenic drugs, and murder, as one by one the other patients begin to die. Is the Pentagram Killer also a patient at the Abernathy Clinic, or is Elizabeth spiraling into madness?