Rose and George Loomis are vacationing in a bungalow at Niagara Falls. Their relationship is getting worse and worse. They met the Cuttlers, spending a late honeymoon in the next bungalow. By accident, Polly Cuttler discovers that Rose has a lover. But what she is not aware of is that Rose and her lover intend to attract George in the falls to murder him...

Jean Peters got the role of Polly Cutler after Anne Baxter withdrew. After her withdrawal, the film was reworked to highlight Marilyn Monroe.

[First line, voiceover as we watch him at the base of the Falls]


George Loomis:
Why should the Falls drag me down here at 5 o'clock in the morning? To show me how big they are and how small I am? To remind me they can get along without any help? All right, so they've proved it. But why not? They've had ten thousand years to get independent. What's so wonderful about that? I suppose I could too, only it might take a little more time.

Errors in geography: The opening shot looks south along the crest of the American Falls. We learn a moment later that it is supposed to be 5 am; if the sun is up at all it should be very low in the east. The actual light on the Falls is from a rather higher angle.

Lyrics by Haven Gillespie
Music by Lionel Newman
Performed by Marilyn Monroe