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.
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
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