Niagara is a 1953 dramatic thriller, film noir directed by Henry Hathaway. Unlike other films noir of the time, Niagara was shot in Technicolor and was one of 20th Century Fox's biggest box office hits of the year. The drama features Marilyn Monroe, Joseph Cotten, Jean Peters and others.
Although it was not written as a star vehicle for Marilyn Monroe, she would dominate the film nonetheless. Along with Gentlemen Prefer Blondes and How to Marry a Millionaire, it solidified Monroe's status as a bona fide box office draw.
Ray and Polly Cutler (Max Showalter and Jean Peters) on a delayed honeymoon at Niagara Falls, find their reserved cabin occupied by George and Rose Loomis (Joseph Cotten and Marilyn Monroe). They politely accept another, less-desirable cabin, and the two couples become acquainted.
George and Rose have a troubled marriage. She is younger and very attractive. He is jealous, depressed and irritable. It is implied that he may have recently been discharged from an Army mental hospital. While touring the falls the following day, Polly sees Rose passionately kissing a man, Patrick. That evening the Cutlers witness George's rage. Rose joins an impromptu party and George storms out and breaks a record playing a tune that he suspects has a secret meaning for Rose.
What George does not know is that Rose is planning his murder. The next day she lures him into following her to the dark tourist tunnel underneath the Falls. There Patrick is to kill...