Jackson and Helen are in love and about to have their first child when they move in with Jackson's mother, Martha, in order to take care of the family estate. But all is not well in this household. Martha is jealous of her son's affection for Helen, and, despite her Southern smile, she's starting to act strangely. As Helen tries to create a happy home life, Martha attempts to divide the family so that Jackson will become hers alone.

In response to political pressure from Senator Lillian DeHaven, the U.S. Navy begins a program that would allow for the eventual integration of women into its services. The program begins with a single trial candidate, Lieutenant Jordan O'Neil, who is chosen specifically for her femininity. O'Neil enters the grueling training program under the command of Master Chief John James Urgayle, who unfairly pushes O'Neil until her determination wins his respect.