Double Jeopardy, according to IMDB: "A jet-setting private eye is trying to find out what happened to a millionaire, a task made difficult by the millionaire's wife. For some reason, she doesn't want him to question her identical twin sister."
Why did NBC trot this out? Well, maybe it had a deal with Hope to give him some extra residuals. Maybe it was in the middle of a bit of instability in that time slot. The week before and after both featured specials to lead off the night before James Garner's Nichols, which itself wasn't setting the world on fire
Or maybe it's simpler than that. Maybe it's just because IT'S AWESOME!
I haven't seen this program, but the premise is interesting, and the cast is even more so. Lauren Bacall (in a rare dual role!) is the twins. Also included are Zsa Zsa Gabor, Jack Kelly, Tom Poston, Diane McBain, and Lee Meriwether. Now, I'm not sure about this, but Ultimate70s TV lists BOTNS fave Hugh O'Brian, too!
It has to be worth a look, and it must not have seemed too dated to run in 1972. Hey, I'd like to see it!