Dangerous Indiscretion.

A rich man, his beautiful wife, and her young lover form a triangle of romance and revenge: One night, advertising executive Jim (C. Thomas Howell) picks up a beautiful woman in a grocery store and they have an affair. Unfortunately for him, she's Caroline Everett (Joan Severance), the wife of rich, powerful, and vengeful businessman Roger Everett (Malcolm McDowell). When he meets her again, their relationship blossoms. Roger finds it out, and sets out to ruin his life.