Jack, the eponymous “Jack of Diamonds” from the title, is a former jeweller who made his living buying and selling diamonds via late-night TV ads. He lives in a rather luxurious, privately owned retirement home, along with fellow residents Rose, Flora and Blanche. Unbeknownst to the four of them, however, the man to whom they’ve entrusted their life savings—a smooth-talking financial wizard named Barney Effward—has been arrested for bilking his clients out of their savings through a Ponzi scheme. Faced with financial ruin—and, consequently, the prospect of being shipped off to a government run retirement facility that is anything but luxurious—the four retirees suddenly find themselves confronting the author of their miserable fate when Effward suffers a medical collapse and is literally delivered among them. Pandemonium ensues as the four residents try to choose between exacting their revenge and recouping their losses.  (https://marciakash.com/scripts/jack-of-diamonds/)