Synopsis
While watching from her train window, Nikki Collins witnesses a murder in a nearby building. When she alerts the police, they think she has read one too many mystery novels. She then enlists a popular mystery writer to help her solve the crime on her own, but her sleuthing attracts the attentions of suitors and killers.
Cast

Deanna Durbin
Nikki Collins / Margo Martin

Ralph Bellamy
Jonathan Waring

David Bruce
Wayne Morgan

George Coulouris
Mr. Saunders, Circus Club Manager

Allen Jenkins
Danny (Waring chauffeur)

Dan Duryea
Arnold Waring

Edward Everett Horton
Mr. Haskell

Patricia Morison
Joyce Willams, Morgan's Girl

Maria Palmer
Margo Martin, Circus Club Singer

Elizabeth Patterson
Aunt Charlotte Waring

Samuel S. Hinds
Mr. Wiggam, Waring Lawyer

William Frawley
Desk Sgt. Brennan

Jacqueline deWit
Miss Fletcher, Morgan's Secretary

Lash LaRue
Circus Club Waiter / Henchman

Jane Adams
Circus Club Photographer

Thurston Hall
Josiah Waring

Ben Carter
Maxwell

Mabel Forrest
Wife

Barbara Bates
Hat Check Girl

Chester Clute
Train Conductor (uncredited)

Joseph Crehan
Train passenger (uncredited)

Fred Aldrich

Ernest Anderson
Carl Andre
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