Badly directed...
I wanted to like it. The actors were capable (especially Eileen Heckart) and the setting was ripe for a good suspenseful affair, but at every turn the writing and directing sabotaged the movie.
What is with the high rating? Bunch of Elizabeth Montgomery fans? I was sad to see her give such a mediocre performance. At least it appeared that way in the slipshod editing of this travesty.