Six-year-old "Mike" goes to live with her pregnant older sister, Babs, who plays string bass in José Iturbi's orchestra. And the orchestra is rapidly turning completely female, what with the draft. As the orchestra travels around the country, Babs' fellow orchestra members intercept and hide her War Office telegram to protect the baby.
Marsha Hunt
Rosalind

Hugh Herbert
Uncle Ferdinand

Harry Davenport
Doctor

Marie Wilson
Marie