The Belles and the Bells.

Niagara Falls, so often a place of honeymoon love is the setting for this engrossing and gripping thriller directed with tight astuteness by the brilliant Henry Hathaway. Hathaway works from a screenplay collectively written by Charles Brackett, Walter Reisch and Richard L. Breen. It stars Joseph Cotton, Marilyn Monroe, Jean Peters, Max Showalter (as Casey Adams), Denis O'Dea and Richard Allan. Music is by Sol Kaplan and cinematography by Joseph MacDonald.

Plot wise it's very simple, the core essence that of an unfaithful wife scheming against her husband - thus... lees de rest.