A respected neurologist, Dr. Mark Steele (Lon Chaney, Jr.) treats his patients successfully with hypnosis, but has troubles of his own from a marriage falling apart, that he cannot treat himself in the same way. His wife Maria (Ramsay Ames) is cheating on him on a regular basis, which is something Mark is well aware of. When Maria returns home one night in the early morning hours after a rendez-vous with her lover, Mark finally tells her that he has had enough and that he wants a divorce. Maria, who is leading a very comfortable life as a doctor's wife, refuses her consent to a divorce, and laughs at him as she does so. That night Mark has a dream about strangling his wife to death.