Young Mrs. Barrett (Marshall) has a 100-watt body and a 10-watt brain, but she's also the pampered wife of an older business tycoon (Gaines) who also happens to have a handsome assistant (Walker). Naturally, 3 into 2 won't go, so hubby is not long for this world if only the intellectually-challenged missus can figure out how to mail a letter.
Marshall does a good kittenish version of Marilyn Monroe, and it's amusing to watch her figure out what a "smarmy" letter is like. I'm sort of surprised the screenplay didn't play up retrieving that incriminating letter more than it did. There's real suspense in post office red tape that keeps getting in the way. Nonetheless, her cocktail party diversion is a well acted and humorously scripted hoot with its decadent Manhattan types. No mayhem or chills here, just a good straightforward story topped off by the expected delicious twist.