Leaving home, young Buddy Baker arrives unannounced at the luxurious Manhattan apartment of his older brother, Alan, a swinging girl chasing bachelor who prefers his carefree life to working in the family business. Pleased at his brother's show of independence, Alan introduces him to New York night life. Their father is unhappy at Alan's mentoring and the loss of an important account. Buddy is so successful that he soon takes over his brother's liquor cabinet and his girl friends. After giving up a woman who lives in the same building, Alan gets beaten by the husband of another conquest. Scared off, Alan alienates his favorite girl friend, Connie, staying away from all commitment. Hit by the futility of his life, Alan urges Buddy to end his swinging life style, but Buddy is having too good a time. After their argument jolts Alan proposes to Connie. Following their marriage, Alan helps their parents reconcile, works seriously in the family business and turns his bachelor pad over to his brother.