Notable as the only television movie which Bernard Herrmann scored and as a partial blueprint for the music of Sisters (1972), the Brian De Palma film.
One of the first NBC Movies of the Week.
The premise of this TV movie is very similar to that of the 1964 British film "The Third Secret", also scripted by Robert L. Joseph. In that film, the phrase "companion in nightmare" is used to describe the murdered psychiatrist.
Last known broadcast was on station CKCO in Ontario, Canada on January 5, 1991.