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When sexy Joy Linnert's airport flirtation with a passenger causes her and her stepsister Jackie to miss their flight home, Joy quickly fascinates pilot Stevie Wilson and convinces the smitten aviator to fly them to Ohio, where their parents live. Although Jackie is herself personable and attractive, Joy's magnetic appeal to men keeps her sister in the background. As soon as the sisters arrive home, Joy is invited to go swimming at the lake. While she is changing, Warren James, an old friend, calls at the house. He is greatly attracted to Jackie and asks her to the country club dance, but when Joy appears in her bathing suit, Warren forgets Jackie completely and follows Joy to the lake. Later, Jackie learns that Joy has accepted Warren's invitation to the dance. As the date of the dance approaches, Mrs. Linnert, who is Joy's mother and Jackie's stepmother, urges Joy to try to find Jackie a date, but she is unable to do so. When Linnert learns this, he is furious and insists that if Jackie does not attend the dance, no one in the family will. Mrs. Linnert then accuses her husband of feeling insulted because his daughter is less popular than hers. In an attempt to stop her parents from quarreling, Jackie insists that she wants to stay home, and advises everyone to get used to the fact that she is less popular than Joy. After the family has left for the dance, Stevie telephones for Joy, and Jackie decides to try Joy's flirting techniques. Stevie quickly succumbs, and while she waits for him to arrive, Jackie alters her dress to look sexier. Meanwhile, at the dance, an infatuated Warren proposes to a horrified Joy. When she explains that she is not ready to settle down, Warren realizes she does not love him and decides to get drunk. Then a newly glamorous Jackie arrives with Stevie, and the boys line up to ask her to dance. Joy is delighted that Jackie has discovered the secret of attracting men and gladly gives up her position as belle of the ball. Later, Jackie looks for Warren, and he drunkenly proposes to her. Although Jackie loves Warren, she realizes that he is too drunk to know what he is doing, and suggests that they drive to the lake for a swim. While they are swimming, some mischievous children steal their clothes, and Jackie and Warren return home dressed in bathrobes. Warren, who is still drunk, makes so much noise that the neighbors call the police, who arrest Jackie and Warren. Misunderstanding the situation, the Jameses and the Linnerts insist that Jackie and Warren get married. Seeing how unhappy this idea makes Warren, Jackie runs off. Then Warren realizes that he does love Jackie and goes after her, intending to marry her after all.