The septuagenarian women of the Summer Ridge Bridge Club have gathered in secret late one July night to check skinny-dipping off their bucket list. But as Francine observes, the jittery members seem more obsessed with body issues and elaborate preparations than actually stripping down and getting in the pool. A pungent smell emanating from the pool shed provides a perfect distraction. When a dead body flops out, it's an answered prayer for Charlotte, since the first item on her list is to solve a murder. Unfortunately for Charlotte and Francine, before they can discover who really killed the man, they must negotiate neighborhood tours of the crime scene, press coverage of their skinny-dipping, an angry homeowners' association, a disastrous appearance on Good Morning America, media offers sought by a hungry publicist, and a clever killer.