Alfred Hitchcock only took on this version of Frederick Knott's play to fulfil his Warners contract. Such was his lack of interest in the project that he claimed he could have phoned in his direction and that the action wouldn't have been any less interesting if he had staged it in a phone box. It's true to say that many of the set pieces literally fall flat, because they were originally composed for presentation in 3-D, but as Ray Milland plots to bump off wife Grace Kelly there are plenty of deft touches that loudly proclaim "genius at work". Milland's sinister sophistication catches the eye, but Kelly's subtly shaded suffering is superb.

When her American lover visits London, a wealthy woman’s jealous husband hatches a plan to murder her and inherit her fortune.