He had someone on the side, so did she!
When Jane Norton inadvertently discovers that Ken, her husband of two years, is dallying with his beautiful secretary, she decides to turn the tables by applying for a job as secretary to philandering architect Barney Dexter, an associate of her husband. Despite cynical advice from her friend Blanche, a three-time divorcée, Jane stays one step ahead of the amorous Dexter and uses Ken's jealousy to get him to renounce his extra-marital indiscretions.