Careful, Soft Shoulders

Careful, Soft Shoulders is a 1942 American comedy film written and directed by Oliver H.P. Garrett. The film has stars such as Virginia Bruce, James Ellison, Aubrey Mather, Sheila Ryan, Ralph Byrd and Sigfrid Tor. The film was released on September 18, 1942, by 20th Century Fox.
Plot.
The attack on Pearl Harbor occurs and America's declaration of war stirs patriotism in Connie Mathers, who until now has been more interested in Washington, D.C. parties and clothes. A comment by shipping magnate's son Tommy Aldrich that people like Connie and him are "useless" to the war effort inspires Connie to prove him wrong.
Offering her services as a spy to sister Agatha's boyfriend Elliott, an army intelligence agent, Connie ends up being approached by a mysterious man who identifies himself as "Mr. Fortune" and assigns tasks to test her, using passages from the book "Gone with the Wind" as a code. When she meets Mr. Fortune's approval, he has her investigate whether Tommy is an enemy spy. A confused Connie confides in Elliott, but soon he disappears.
After her sister also vanishes, Connie realizes she's been duped by Mr. Fortune, who proceeds to take her and Tommy captive as well. Luckily, she escapes in time to help the military head off an enemy submarine, saving the day.