The third film in the "3 Smart Girls" trilogy starring Deanna Durbin as Penny Craig, the youngest sister in the Craig Family. Now all grown up, she goes to work in a munitions factory during World War II determined to do her bit for America whilst wanting to be close to a young pilot, Bill Morley (Joseph Cotten). He gets posted overseas leaving Penny to worry for his safety. One of the film's songs was nominated for an Academy award.