Can a couple keep important secrets from Communist spies?

Katharine Hilliard, mousy dean of a stuffy music school, meets and is insulted by swing band leader Barry Clayton on a train. To "show" him she takes a friend's advice, removes her glasses, and puts on a designer gown. Naturally, she becomes gorgeous. Soon, both Barry and crooner Jimmy Hale are after her, and she finds herself in the midst of triangles and misunderstandings.

Jeff Carter has put an end to the town's delinquency with a boys' club. Young hoodlum Danny shows up and influences teenagers Doris, Willy and Leo. They hang out at a juke joint where Eve (one of Marilyn's first bit parts) works. When Jeff tries to stop a robbery planned by Danny, he is killed and Danny goes on trial.