What a great recommendation, I really liked this movie. It's a title that I've completely overlooked, and it reminds me that I need to see more movies from the 1960s.
I'm maybe a few years late on this observation but Audrey Hepburn, wow, she was a real movie star. There's some over the top mugging in a few scenes but she just has such a great screen presence here that all is forgiven.
Despite the movie being almost 50 years old, the twists still felt well done and surprising. You start to question everyone's motives as the plot unfolds.
Seeing this movie also makes me want to seek out more films with Walter Matthau. He and Cary Grant play their characters with this great tone of understated humor. There's a scene I loved where Walter Matthau is talking to Audrey Hepburn on the phone, and as he's talking, the camera tracks him up and down as he exercises by doing a set of squats. The reason for this seems to be nothing more than it's very funny, and it so completely fits the tone of his character.
