The Widow Couderc
La Veuve Couderc (original)
Starring Simone Signoret, Alain Delon, Ottavia Piccolo, Jean Tissier, Monique Chaumette, Boby Lapointe, Pierre Collet, Jean-Pierre Castaldi, Robert Favart, André Rouyer
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.
Watch it here
Not found streaming from Denmark.