American professor John Holden arrives in London for a conference on parapsychology only to discover that the colleague he was supposed to meet was killed in a freak accident the day before. It turns out that the deceased had been investigating a cult lead by Dr. Julian Karswell. Though a skeptic, Holden is suspicious of the devil-worshiping Karswell. Following a trail of mysterious manuscripts, Holden enters a world that makes him question his faith in science.

Shows masked mental patients enacting various schizophrenic symptoms as they were understood at the time. A disturbing film that raises questions about the condition and treatment of its subjects. (archive.org) “Abstract: This film describes and demonstrates four types of schizophrenia. Filmed at various New York institutions, it shows patients singly and grouped in large, outside recreational areas. Some patients are blindfolded. Symptoms shown include: social apathy, delusions, hallucinations, hebephrenic reactions, cerea flexibilitas, rigidity, motor stereotypes, posturing, and echopraxia.” (Guide to Mental Health Motion Pictures)