A bored and unfaithful wife goes on vacation to Niagara Falls with her tormented husband. What the man doesn't know is that she and her lover are plotting to murder him. Completely unexpected developments change the course of the plot. Niagara is Marilyn Monroe's first major dramatic role - here, in this polished and Hitchcockian suspense melodrama, the great Hollywood myth of Marilyn Monroe was born. However, and this is a significant one, Monroe proves to be an excellent actress, far greater than the image of the frivolous blonde bombshell that will stick to her to this day. She serves up an American femme fatale, adoring a tight dress, strutting around, and red lips, absolutely scorching the screen. In short, this is a great classic that should not be missed.