"On a train full of draftees heading for Europe, the DePaul sisters are looking for a third singer to transform their duo into a trio. They find her in Mitzi --a down-home girl with a secret: she's a Nazi spy with a slinky Dietrich accent and a microphone conveniently hidden in her lipstick. Seventeen rollicking Big Band numbers evoke the originals of the period while gently spoofing musical memories of the wartime era."--Publisher.