Seven Days… Seven Nights
Moderato cantabile (original)
A wealthy and bored woman (Moreau) is witness of a murder in affection and meets another witness (Belmondo). She asks him about the history of the victim and falls in love with him.
Starring Jeanne Moreau, Jean-Paul Belmondo, Jean Deschamps, Colette Régis, Didier Haudepin, Pascale de Boysson, Valeric Dobuzinsky
Watch "Seven Days… Seven Nights" on Kanopy released in 1960. It's a drama and action & adventure movie, and has a rating of 6.9 out of 10 from Imdb which is usually fine for this kind of movie.