It is a television adaptation of Ethel Lina White's novel Some Must Watch which was filmed in 1946 as The Spiral Staircase.
The production was the idea of David Susskind who originally wanted Jane Fonda to play the lead.
Spiral Staircase was to be the first of eight productions of David O. Selznick movies.
Eventually the lead role went to Elizabeth Montgomery and her then-husband Gig Young.
[2] "It was a routine play but they made it look pretty good", said the Los Angeles Times.