Suave, cold-blooded Ray Milland plots to murder his beautiful wife (Grace Kelly) and leaves the key to their apartment outside for his hired killer (Anthony Dawson). When the killer has a bit of trouble - to put it mildly - with a pair of scissors, a new Pandora’s box of complications opens up. Unfortunately, scheming Milland may still be able to pull off his plan - that is, unless Kelly’s old flame, Robert Cummings and unflappable Scotland Yard inspector John Williams can determine what really happened that fateful night. Maestro Hitchcock masterfully adapts Frederick Knott’s hit stage-play to the big screen (it was originally presented in 3-D).