This somehow reminds me of the movie "The Grifters" except that its a bit more lighthearted in the RMT fashion and no one gets killed.

Fred Gwynne plays Harrison Dillard "Dilly" Wentworth, a big wheel financier married to a devoted yet (his description) dull wife he seems to love as a matter of noblesse oblige (or maybe it was that $1,000,000 she loaned him, no strings attached, to get his career started).

Evie Juster (I always wondered what she looked like...I always picture her as this little 4'8" waif with blond curls, sort of her generation's Nancy Cartwright) plays Wilhelmina "Willy" Zurich, who says she needs help investing her late husband's money. Going to lunch together, they find they have a bit more than their similar nicknames in common, fall in lust, and the affair begins.

Dilly wants a kept woman. Willy (along with her con artist brother played by Lloyd Battista) wants to scam a ton of Dilly's $$$$ by cooking up a scheme to make all three of them some illegal moolah. Battista's character says he knows Dilly's also a crook at heart...he's already cheating on his wife, and will probably not mind cheating a bit more. Battista also plays a longtime friend of equal social standing of Dilly's who's also friends with Mrs. Dilly.

We end up with dualing schemes here, and given the morality tales of the RMT, you can guess the outcome. Cute little show with Hi Brown guesting as a money courier. 