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At the turn of the century, Dr. Robert Vance runs a psychiatric clinic in a remote part of England. Plagued by a series of violent killings at the clinic in which young female deafmutes have been slashed to death with a razor, the doctor has few patients and lives in isolation with his wife, Lizabeth. Unknown to the small community, Lizabeth's sister Laura is also living at the clinic. Once a beautiful girl, she is now horribly disfigured from falling into a pit of quicklime. Although Vance had been blamed for the accident, he was acquitted because of lack of evidence. Mary, a new nurse, and a young woman arrive at the clinic; when the woman is brutally murdered with a razor, Vance persuades Mary to help him secretly dispose of the body. A short time later, Mary is attacked in her bedroom but saved by the cloak-shrouded Laura, who unmasks Lizabeth as the killer. When Laura accuses her sister of causing the quicklime accident because she was jealous of Vance's attentions, Lizabeth kills Laura and then commits suicide. With the death of the two sisters, Vance is free to begin a new life with Mary.