The Last Original Wife by Dorothea Benton Frank
One of my favorites I've ever read from Ms. Frank. The story is about Les the middle aged wife of Wes. The issue is that in Wes's posh circle of friends, Les is the last of the "original" wives. His friends are all on their second marriages to young, gorgeous girls, with whom she has nothing in common. She's had enough of Wes's controlling ways and feeling like Wes is doing her a "favor" by not dumping her for a newer model. After an incident in Scotland while on vacation and a discovery about their finances, Les decides she's had enough and up and leaves to stay with her brother in Charleston. What follows is a lesson in self-discovery, identity, what happiness really is and what you are willing to put up with in the last part of your life to truly live. I adored the story!