Red Salute

Drue Van Allen, the daughter of an American general, is in love with communist graduate student Leonard Arner. When Leonard is ejected from a college campus for speaking to the students, a newspaper photographer takes a picture of him in Drue's car and prints it on the front page. When Drue refuses to listen to reason, the general tricks her into boarding an airplane bound for Mexico, supposedly to see her aunt Betty off, then locks her in.