Three bachelors find themselves forced to take care of a baby left by one of the guys' girlfriends.
The three men – Peter, Michael, and Jack – are living happily together with Mary, who is now five, and her mother, Sylvia. Peter and Michael continue their careers as an architect and cartoonist, while Jack has very few acting roles. Sylvia has become a famous actress and is dating her director Edward who wishes to marry her, but Sylvia is unsure how it will affect Mary. Sylvia and Peter are clearly in love with each other, although Peter has difficulty admitting his true feelings. When visiting, Sylvia's mother advises her daughter that Peter may never be able to properly express or admit his true feelings. Sylvia, realizing she wants to get married and start a real family, accepts Edward's marriage proposal and announces to the group that she and Mary will be moving to the United Kingdom after the wedding.