Not TV, but that's where I saw it.

https://en.wikipedia.org/wiki/Rope_(film)
No spoiler.
Rope is a 1948 American psychological crime thriller film directed by Alfred Hitchcock, based on the 1929 play of the same name by Patrick Hamilton. The film was adapted by Hume Cronyn with a screenplay by Arthur Laurents.

The film was produced by Hitchcock and Sidney Bernstein as the first of their Transatlantic Pictures productions. Starring James Stewart, John Dall and Farley Granger, this is the first of Hitchcock's Technicolor films, and is notable for taking place in real time and being edited so as to appear as four long shots through the use of stitched-together long takes. It is the second of Hitchcock's "limited setting" films, the first being Lifeboat (1944). The original play was said to be inspired by the real-life murder of 14-year-old Bobby Franks in 1924 by University of Chicago students Nathan Leopold and Richard Loeb.

If you ever heard of "Leopold and Loeb", it's from their trial, defended by Clarence Darrow, no less.
https://www.britannica.com/biography/Leopold-and-Loeb
In more detail: https://en.wikipedia.org/wiki/Leopold_and_Loeb

The vivedness of the cinematography stands out in my mind even to this day. James Stewart, as always, is excellent. A good many years before 1984, I watched an interview of Alfred Hitchcok. He mentioned that "Rope" was one of his favorite films.