I'm not a fan of Cary Grant - I found him to play the same kind of parts over and over without much effort, but this is one of his more exceptional films and is largely perhaps due to the great script and gifted co-stars who included Deborah Kerr and Cathleen Nesbitt who won an award for her role as his foreign Grandmother.
Every film should have a beautiful or very haunting theme score playing off and on throughout - this has both! The tune will linger long after the film is over...
There are some very emotional moments in this movie; one that gets me sobbing quietly to myself every time during the scene where Grant's character goes back to see where his Grandmother lived shortly after her death and where he last saw her shortly before, and sentimentally touches the cushions of chairs where she sat, and other things in the room... He wanders through the place where she lived hearing the echoes of a tune she played on his last visit at the Piano - sounds really 'slushy' I know, but anyone who does not understand this scene or behaviour will have never loved another human being in my opinion... It's the sort of thing I have done with lost loved ones in my life many times...
A movie classic that will definitely require a box of tissues at the ready - and for all the right reasons!