I had forgotten that most if not all of it happens in one single room. The planning of it is a display of extraordinary craftsmanship. Not a lagging moment. I was riveted to the, let's face it, preposterous plot from beginning to end. Ray Milland is a credible monster in elegant and civilized clothing. Grace Kelly, a peach as the unfaithful wife who stays home to cut newspaper clippings of her husband's past glories. Yeah, right. Robert Cummings has always been a mystery to me. A popular leading man with a long career. He only exudes a campy, if lightweight vibe that almost works in comedies and when he's in a supporting role - My Geisha and What A Way To Go with Shirley MacLaine are good examples. Here as Grace Kelly's secret lover, I don't know what to say. John Williams. very funny again as the Scotland Yard inspector, the same character to a T he played in Midnight Lace with Doris Day or was it his twin brother? In any case, no Hitchcock fan can afford to miss this filmed play, filmed by one of the undisputed greats.